diff --git a/.github/PULL_REQUEST_TEMPLATE.md b/.github/PULL_REQUEST_TEMPLATE.md
index 6ad8ee4..898d8f5 100644
--- a/.github/PULL_REQUEST_TEMPLATE.md
+++ b/.github/PULL_REQUEST_TEMPLATE.md
@@ -4,7 +4,7 @@
 | New feature?   | yes/no
 | Related issues | Fix #... <!-- prefix each issue number with "Fix #", if any -->
 | Has BC-break   | yes/no
-| License        | GNU AGPL-v3
+| License        | CeCILL v2.1
 
 **Checklist:**
 <!--
diff --git a/LICENSE.md b/LICENSE.md
deleted file mode 100644
index c7f159a..0000000
--- a/LICENSE.md
+++ /dev/null
@@ -1,614 +0,0 @@
-### GNU AFFERO GENERAL PUBLIC LICENSE
-
-Version 3, 19 November 2007
-
-Copyright (C) 2007 Free Software Foundation, Inc.
-<https://fsf.org/>
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-Everyone is permitted to copy and distribute verbatim copies of this
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-### Preamble
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-
-IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
-WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR
-CONVEYS THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
-INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES
-ARISING OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT
-NOT LIMITED TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR
-LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM
-TO OPERATE WITH ANY OTHER PROGRAMS), EVEN IF SUCH HOLDER OR OTHER
-PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
-
-#### 17. Interpretation of Sections 15 and 16.
-
-If the disclaimer of warranty and limitation of liability provided
-above cannot be given local legal effect according to their terms,
-reviewing courts shall apply local law that most closely approximates
-an absolute waiver of all civil liability in connection with the
-Program, unless a warranty or assumption of liability accompanies a
-copy of the Program in return for a fee.
diff --git a/LICENSE.txt b/LICENSE.txt
new file mode 100644
index 0000000..e7c9f89
--- /dev/null
+++ b/LICENSE.txt
@@ -0,0 +1,519 @@
+
+  CeCILL FREE SOFTWARE LICENSE AGREEMENT
+
+Version 2.1 dated 2013-06-21
+
+
+    Notice
+
+This Agreement is a Free Software license agreement that is the result
+of discussions between its authors in order to ensure compliance with
+the two main principles guiding its drafting:
+
+  * firstly, compliance with the principles governing the distribution
+    of Free Software: access to source code, broad rights granted to users,
+  * secondly, the election of a governing law, French law, with which it
+    is conformant, both as regards the law of torts and intellectual
+    property law, and the protection that it offers to both authors and
+    holders of the economic rights over software.
+
+The authors of the CeCILL (for Ce[a] C[nrs] I[nria] L[ogiciel] L[ibre]) 
+license are: 
+
+Commissariat à l'énergie atomique et aux énergies alternatives - CEA, a
+public scientific, technical and industrial research establishment,
+having its principal place of business at 25 rue Leblanc, immeuble Le
+Ponant D, 75015 Paris, France.
+
+Centre National de la Recherche Scientifique - CNRS, a public scientific
+and technological establishment, having its principal place of business
+at 3 rue Michel-Ange, 75794 Paris cedex 16, France.
+
+Institut National de Recherche en Informatique et en Automatique -
+Inria, a public scientific and technological establishment, having its
+principal place of business at Domaine de Voluceau, Rocquencourt, BP
+105, 78153 Le Chesnay cedex, France.
+
+
+    Preamble
+
+The purpose of this Free Software license agreement is to grant users
+the right to modify and redistribute the software governed by this
+license within the framework of an open source distribution model.
+
+The exercising of this right is conditional upon certain obligations for
+users so as to preserve this status for all subsequent redistributions.
+
+In consideration of access to the source code and the rights to copy,
+modify and redistribute granted by the license, users are provided only
+with a limited warranty and the software's author, the holder of the
+economic rights, and the successive licensors only have limited liability.
+
+In this respect, the risks associated with loading, using, modifying
+and/or developing or reproducing the software by the user are brought to
+the user's attention, given its Free Software status, which may make it
+complicated to use, with the result that its use is reserved for
+developers and experienced professionals having in-depth computer
+knowledge. Users are therefore encouraged to load and test the
+suitability of the software as regards their requirements in conditions
+enabling the security of their systems and/or data to be ensured and,
+more generally, to use and operate it in the same conditions of
+security. This Agreement may be freely reproduced and published,
+provided it is not altered, and that no provisions are either added or
+removed herefrom.
+
+This Agreement may apply to any or all software for which the holder of
+the economic rights decides to submit the use thereof to its provisions.
+
+Frequently asked questions can be found on the official website of the
+CeCILL licenses family (http://www.cecill.info/index.en.html) for any 
+necessary clarification.
+
+
+    Article 1 - DEFINITIONS
+
+For the purpose of this Agreement, when the following expressions
+commence with a capital letter, they shall have the following meaning:
+
+Agreement: means this license agreement, and its possible subsequent
+versions and annexes.
+
+Software: means the software in its Object Code and/or Source Code form
+and, where applicable, its documentation, "as is" when the Licensee
+accepts the Agreement.
+
+Initial Software: means the Software in its Source Code and possibly its
+Object Code form and, where applicable, its documentation, "as is" when
+it is first distributed under the terms and conditions of the Agreement.
+
+Modified Software: means the Software modified by at least one
+Contribution.
+
+Source Code: means all the Software's instructions and program lines to
+which access is required so as to modify the Software.
+
+Object Code: means the binary files originating from the compilation of
+the Source Code.
+
+Holder: means the holder(s) of the economic rights over the Initial
+Software.
+
+Licensee: means the Software user(s) having accepted the Agreement.
+
+Contributor: means a Licensee having made at least one Contribution.
+
+Licensor: means the Holder, or any other individual or legal entity, who
+distributes the Software under the Agreement.
+
+Contribution: means any or all modifications, corrections, translations,
+adaptations and/or new functions integrated into the Software by any or
+all Contributors, as well as any or all Internal Modules.
+
+Module: means a set of sources files including their documentation that
+enables supplementary functions or services in addition to those offered
+by the Software.
+
+External Module: means any or all Modules, not derived from the
+Software, so that this Module and the Software run in separate address
+spaces, with one calling the other when they are run.
+
+Internal Module: means any or all Module, connected to the Software so
+that they both execute in the same address space.
+
+GNU GPL: means the GNU General Public License version 2 or any
+subsequent version, as published by the Free Software Foundation Inc.
+
+GNU Affero GPL: means the GNU Affero General Public License version 3 or
+any subsequent version, as published by the Free Software Foundation Inc.
+
+EUPL: means the European Union Public License version 1.1 or any
+subsequent version, as published by the European Commission.
+
+Parties: mean both the Licensee and the Licensor.
+
+These expressions may be used both in singular and plural form.
+
+
+    Article 2 - PURPOSE
+
+The purpose of the Agreement is the grant by the Licensor to the
+Licensee of a non-exclusive, transferable and worldwide license for the
+Software as set forth in Article 5 <#scope> hereinafter for the whole
+term of the protection granted by the rights over said Software.
+
+
+    Article 3 - ACCEPTANCE
+
+3.1 The Licensee shall be deemed as having accepted the terms and
+conditions of this Agreement upon the occurrence of the first of the
+following events:
+
+  * (i) loading the Software by any or all means, notably, by
+    downloading from a remote server, or by loading from a physical medium;
+  * (ii) the first time the Licensee exercises any of the rights granted
+    hereunder.
+
+3.2 One copy of the Agreement, containing a notice relating to the
+characteristics of the Software, to the limited warranty, and to the
+fact that its use is restricted to experienced users has been provided
+to the Licensee prior to its acceptance as set forth in Article 3.1
+<#accepting> hereinabove, and the Licensee hereby acknowledges that it
+has read and understood it.
+
+
+    Article 4 - EFFECTIVE DATE AND TERM
+
+
+      4.1 EFFECTIVE DATE
+
+The Agreement shall become effective on the date when it is accepted by
+the Licensee as set forth in Article 3.1 <#accepting>.
+
+
+      4.2 TERM
+
+The Agreement shall remain in force for the entire legal term of
+protection of the economic rights over the Software.
+
+
+    Article 5 - SCOPE OF RIGHTS GRANTED
+
+The Licensor hereby grants to the Licensee, who accepts, the following
+rights over the Software for any or all use, and for the term of the
+Agreement, on the basis of the terms and conditions set forth hereinafter.
+
+Besides, if the Licensor owns or comes to own one or more patents
+protecting all or part of the functions of the Software or of its
+components, the Licensor undertakes not to enforce the rights granted by
+these patents against successive Licensees using, exploiting or
+modifying the Software. If these patents are transferred, the Licensor
+undertakes to have the transferees subscribe to the obligations set
+forth in this paragraph.
+
+
+      5.1 RIGHT OF USE
+
+The Licensee is authorized to use the Software, without any limitation
+as to its fields of application, with it being hereinafter specified
+that this comprises:
+
+ 1. permanent or temporary reproduction of all or part of the Software
+    by any or all means and in any or all form.
+
+ 2. loading, displaying, running, or storing the Software on any or all
+    medium.
+
+ 3. entitlement to observe, study or test its operation so as to
+    determine the ideas and principles behind any or all constituent
+    elements of said Software. This shall apply when the Licensee
+    carries out any or all loading, displaying, running, transmission or
+    storage operation as regards the Software, that it is entitled to
+    carry out hereunder.
+
+
+      5.2 ENTITLEMENT TO MAKE CONTRIBUTIONS
+
+The right to make Contributions includes the right to translate, adapt,
+arrange, or make any or all modifications to the Software, and the right
+to reproduce the resulting software.
+
+The Licensee is authorized to make any or all Contributions to the
+Software provided that it includes an explicit notice that it is the
+author of said Contribution and indicates the date of the creation thereof.
+
+
+      5.3 RIGHT OF DISTRIBUTION
+
+In particular, the right of distribution includes the right to publish,
+transmit and communicate the Software to the general public on any or
+all medium, and by any or all means, and the right to market, either in
+consideration of a fee, or free of charge, one or more copies of the
+Software by any means.
+
+The Licensee is further authorized to distribute copies of the modified
+or unmodified Software to third parties according to the terms and
+conditions set forth hereinafter.
+
+
+        5.3.1 DISTRIBUTION OF SOFTWARE WITHOUT MODIFICATION
+
+The Licensee is authorized to distribute true copies of the Software in
+Source Code or Object Code form, provided that said distribution
+complies with all the provisions of the Agreement and is accompanied by:
+
+ 1. a copy of the Agreement,
+
+ 2. a notice relating to the limitation of both the Licensor's warranty
+    and liability as set forth in Articles 8 and 9,
+
+and that, in the event that only the Object Code of the Software is
+redistributed, the Licensee allows effective access to the full Source
+Code of the Software for a period of at least three years from the
+distribution of the Software, it being understood that the additional
+acquisition cost of the Source Code shall not exceed the cost of the
+data transfer.
+
+
+        5.3.2 DISTRIBUTION OF MODIFIED SOFTWARE
+
+When the Licensee makes a Contribution to the Software, the terms and
+conditions for the distribution of the resulting Modified Software
+become subject to all the provisions of this Agreement.
+
+The Licensee is authorized to distribute the Modified Software, in
+source code or object code form, provided that said distribution
+complies with all the provisions of the Agreement and is accompanied by:
+
+ 1. a copy of the Agreement,
+
+ 2. a notice relating to the limitation of both the Licensor's warranty
+    and liability as set forth in Articles 8 and 9,
+
+and, in the event that only the object code of the Modified Software is
+redistributed,
+
+ 3. a note stating the conditions of effective access to the full source
+    code of the Modified Software for a period of at least three years
+    from the distribution of the Modified Software, it being understood
+    that the additional acquisition cost of the source code shall not
+    exceed the cost of the data transfer.
+
+
+        5.3.3 DISTRIBUTION OF EXTERNAL MODULES
+
+When the Licensee has developed an External Module, the terms and
+conditions of this Agreement do not apply to said External Module, that
+may be distributed under a separate license agreement.
+
+
+        5.3.4 COMPATIBILITY WITH OTHER LICENSES
+
+The Licensee can include a code that is subject to the provisions of one
+of the versions of the GNU GPL, GNU Affero GPL and/or EUPL in the
+Modified or unmodified Software, and distribute that entire code under
+the terms of the same version of the GNU GPL, GNU Affero GPL and/or EUPL.
+
+The Licensee can include the Modified or unmodified Software in a code
+that is subject to the provisions of one of the versions of the GNU GPL,
+GNU Affero GPL and/or EUPL and distribute that entire code under the
+terms of the same version of the GNU GPL, GNU Affero GPL and/or EUPL.
+
+
+    Article 6 - INTELLECTUAL PROPERTY
+
+
+      6.1 OVER THE INITIAL SOFTWARE
+
+The Holder owns the economic rights over the Initial Software. Any or
+all use of the Initial Software is subject to compliance with the terms
+and conditions under which the Holder has elected to distribute its work
+and no one shall be entitled to modify the terms and conditions for the
+distribution of said Initial Software.
+
+The Holder undertakes that the Initial Software will remain ruled at
+least by this Agreement, for the duration set forth in Article 4.2 <#term>.
+
+
+      6.2 OVER THE CONTRIBUTIONS
+
+The Licensee who develops a Contribution is the owner of the
+intellectual property rights over this Contribution as defined by
+applicable law.
+
+
+      6.3 OVER THE EXTERNAL MODULES
+
+The Licensee who develops an External Module is the owner of the
+intellectual property rights over this External Module as defined by
+applicable law and is free to choose the type of agreement that shall
+govern its distribution.
+
+
+      6.4 JOINT PROVISIONS
+
+The Licensee expressly undertakes:
+
+ 1. not to remove, or modify, in any manner, the intellectual property
+    notices attached to the Software;
+
+ 2. to reproduce said notices, in an identical manner, in the copies of
+    the Software modified or not.
+
+The Licensee undertakes not to directly or indirectly infringe the
+intellectual property rights on the Software of the Holder and/or
+Contributors, and to take, where applicable, vis-à-vis its staff, any
+and all measures required to ensure respect of said intellectual
+property rights of the Holder and/or Contributors.
+
+
+    Article 7 - RELATED SERVICES
+
+7.1 Under no circumstances shall the Agreement oblige the Licensor to
+provide technical assistance or maintenance services for the Software.
+
+However, the Licensor is entitled to offer this type of services. The
+terms and conditions of such technical assistance, and/or such
+maintenance, shall be set forth in a separate instrument. Only the
+Licensor offering said maintenance and/or technical assistance services
+shall incur liability therefor.
+
+7.2 Similarly, any Licensor is entitled to offer to its licensees, under
+its sole responsibility, a warranty, that shall only be binding upon
+itself, for the redistribution of the Software and/or the Modified
+Software, under terms and conditions that it is free to decide. Said
+warranty, and the financial terms and conditions of its application,
+shall be subject of a separate instrument executed between the Licensor
+and the Licensee.
+
+
+    Article 8 - LIABILITY
+
+8.1 Subject to the provisions of Article 8.2, the Licensee shall be
+entitled to claim compensation for any direct loss it may have suffered
+from the Software as a result of a fault on the part of the relevant
+Licensor, subject to providing evidence thereof.
+
+8.2 The Licensor's liability is limited to the commitments made under
+this Agreement and shall not be incurred as a result of in particular:
+(i) loss due the Licensee's total or partial failure to fulfill its
+obligations, (ii) direct or consequential loss that is suffered by the
+Licensee due to the use or performance of the Software, and (iii) more
+generally, any consequential loss. In particular the Parties expressly
+agree that any or all pecuniary or business loss (i.e. loss of data,
+loss of profits, operating loss, loss of customers or orders,
+opportunity cost, any disturbance to business activities) or any or all
+legal proceedings instituted against the Licensee by a third party,
+shall constitute consequential loss and shall not provide entitlement to
+any or all compensation from the Licensor.
+
+
+    Article 9 - WARRANTY
+
+9.1 The Licensee acknowledges that the scientific and technical
+state-of-the-art when the Software was distributed did not enable all
+possible uses to be tested and verified, nor for the presence of
+possible defects to be detected. In this respect, the Licensee's
+attention has been drawn to the risks associated with loading, using,
+modifying and/or developing and reproducing the Software which are
+reserved for experienced users.
+
+The Licensee shall be responsible for verifying, by any or all means,
+the suitability of the product for its requirements, its good working
+order, and for ensuring that it shall not cause damage to either persons
+or properties.
+
+9.2 The Licensor hereby represents, in good faith, that it is entitled
+to grant all the rights over the Software (including in particular the
+rights set forth in Article 5 <#scope>).
+
+9.3 The Licensee acknowledges that the Software is supplied "as is" by
+the Licensor without any other express or tacit warranty, other than
+that provided for in Article 9.2 <#good-faith> and, in particular,
+without any warranty as to its commercial value, its secured, safe,
+innovative or relevant nature.
+
+Specifically, the Licensor does not warrant that the Software is free
+from any error, that it will operate without interruption, that it will
+be compatible with the Licensee's own equipment and software
+configuration, nor that it will meet the Licensee's requirements.
+
+9.4 The Licensor does not either expressly or tacitly warrant that the
+Software does not infringe any third party intellectual property right
+relating to a patent, software or any other property right. Therefore,
+the Licensor disclaims any and all liability towards the Licensee
+arising out of any or all proceedings for infringement that may be
+instituted in respect of the use, modification and redistribution of the
+Software. Nevertheless, should such proceedings be instituted against
+the Licensee, the Licensor shall provide it with technical and legal
+expertise for its defense. Such technical and legal expertise shall be
+decided on a case-by-case basis between the relevant Licensor and the
+Licensee pursuant to a memorandum of understanding. The Licensor
+disclaims any and all liability as regards the Licensee's use of the
+name of the Software. No warranty is given as regards the existence of
+prior rights over the name of the Software or as regards the existence
+of a trademark.
+
+
+    Article 10 - TERMINATION
+
+10.1 In the event of a breach by the Licensee of its obligations
+hereunder, the Licensor may automatically terminate this Agreement
+thirty (30) days after notice has been sent to the Licensee and has
+remained ineffective.
+
+10.2 A Licensee whose Agreement is terminated shall no longer be
+authorized to use, modify or distribute the Software. However, any
+licenses that it may have granted prior to termination of the Agreement
+shall remain valid subject to their having been granted in compliance
+with the terms and conditions hereof.
+
+
+    Article 11 - MISCELLANEOUS
+
+
+      11.1 EXCUSABLE EVENTS
+
+Neither Party shall be liable for any or all delay, or failure to
+perform the Agreement, that may be attributable to an event of force
+majeure, an act of God or an outside cause, such as defective
+functioning or interruptions of the electricity or telecommunications
+networks, network paralysis following a virus attack, intervention by
+government authorities, natural disasters, water damage, earthquakes,
+fire, explosions, strikes and labor unrest, war, etc.
+
+11.2 Any failure by either Party, on one or more occasions, to invoke
+one or more of the provisions hereof, shall under no circumstances be
+interpreted as being a waiver by the interested Party of its right to
+invoke said provision(s) subsequently.
+
+11.3 The Agreement cancels and replaces any or all previous agreements,
+whether written or oral, between the Parties and having the same
+purpose, and constitutes the entirety of the agreement between said
+Parties concerning said purpose. No supplement or modification to the
+terms and conditions hereof shall be effective as between the Parties
+unless it is made in writing and signed by their duly authorized
+representatives.
+
+11.4 In the event that one or more of the provisions hereof were to
+conflict with a current or future applicable act or legislative text,
+said act or legislative text shall prevail, and the Parties shall make
+the necessary amendments so as to comply with said act or legislative
+text. All other provisions shall remain effective. Similarly, invalidity
+of a provision of the Agreement, for any reason whatsoever, shall not
+cause the Agreement as a whole to be invalid.
+
+
+      11.5 LANGUAGE
+
+The Agreement is drafted in both French and English and both versions
+are deemed authentic.
+
+
+    Article 12 - NEW VERSIONS OF THE AGREEMENT
+
+12.1 Any person is authorized to duplicate and distribute copies of this
+Agreement.
+
+12.2 So as to ensure coherence, the wording of this Agreement is
+protected and may only be modified by the authors of the License, who
+reserve the right to periodically publish updates or new versions of the
+Agreement, each with a separate number. These subsequent versions may
+address new issues encountered by Free Software.
+
+12.3 Any Software distributed under a given version of the Agreement may
+only be subsequently distributed under the same version of the Agreement
+or a subsequent version, subject to the provisions of Article 5.3.4
+<#compatibility>.
+
+
+    Article 13 - GOVERNING LAW AND JURISDICTION
+
+13.1 The Agreement is governed by French law. The Parties agree to
+endeavor to seek an amicable solution to any disagreements or disputes
+that may arise during the performance of the Agreement.
+
+13.2 Failing an amicable solution within two (2) months as from their
+occurrence, and unless emergency proceedings are necessary, the
+disagreements or disputes shall be referred to the Paris Courts having
+jurisdiction, by the more diligent Party.
+
diff --git a/Makefile b/Makefile
index b988a3a..13277ea 100644
--- a/Makefile
+++ b/Makefile
@@ -34,7 +34,7 @@ release: env
 	@echo -e "\e[1mCreating release with version number \e[36m$$RELEASE_NUMBER\e[0m"
 	@echo
 
-	sed "s/^__version__ =.*/__version__ = '$$RELEASE_NUMBER'/g" _kosmorro/__version__.py > version.py
+	sed "s/^__version__ =.*/__version__ = \"$$RELEASE_NUMBER\"/g" _kosmorro/__version__.py > version.py
 	mv version.py _kosmorro/__version__.py
 
 	pipenv run python setup.py extract_messages --output-file=_kosmorro/locales/messages.pot > /dev/null
diff --git a/_kosmorro/__init__.py b/_kosmorro/__init__.py
index 239afac..e5a0d9b 100644
--- a/_kosmorro/__init__.py
+++ b/_kosmorro/__init__.py
@@ -1,17 +1 @@
 #!/usr/bin/env python3
-
-#    Kosmorro - Compute The Next Ephemerides
-#    Copyright (C) 2019  Jérôme Deuchnord <jerome@deuchnord.fr>
-#
-#    This program is free software: you can redistribute it and/or modify
-#    it under the terms of the GNU Affero General Public License as
-#    published by the Free Software Foundation, either version 3 of the
-#    License, or (at your option) any later version.
-#
-#    This program is distributed in the hope that it will be useful,
-#    but WITHOUT ANY WARRANTY; without even the implied warranty of
-#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-#    GNU Affero General Public License for more details.
-#
-#    You should have received a copy of the GNU Affero General Public License
-#    along with this program.  If not, see <https://www.gnu.org/licenses/>.
diff --git a/_kosmorro/__version__.py b/_kosmorro/__version__.py
index 8ef13af..10be16d 100644
--- a/_kosmorro/__version__.py
+++ b/_kosmorro/__version__.py
@@ -1,25 +1,9 @@
 #!/usr/bin/env python3
 
-#    Kosmorro - Compute The Next Ephemerides
-#    Copyright (C) 2019  Jérôme Deuchnord <jerome@deuchnord.fr>
-#
-#    This program is free software: you can redistribute it and/or modify
-#    it under the terms of the GNU Affero General Public License as
-#    published by the Free Software Foundation, either version 3 of the
-#    License, or (at your option) any later version.
-#
-#    This program is distributed in the hope that it will be useful,
-#    but WITHOUT ANY WARRANTY; without even the implied warranty of
-#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-#    GNU Affero General Public License for more details.
-#
-#    You should have received a copy of the GNU Affero General Public License
-#    along with this program.  If not, see <https://www.gnu.org/licenses/>.
-
 __title__ = "kosmorro"
 __description__ = "A program that computes your ephemerides"
 __url__ = "https://kosmorro.space"
-__version__ = '0.10.1'
+__version__ = "0.10.1"
 __author__ = "Jérôme Deuchnord"
 __author_email__ = "jerome@deuchnord.fr"
 __license__ = "AGPL"
diff --git a/_kosmorro/debug.py b/_kosmorro/debug.py
index f1b18f0..6c9fe39 100644
--- a/_kosmorro/debug.py
+++ b/_kosmorro/debug.py
@@ -13,4 +13,3 @@ def debug_print(what, force: bool = False):
         print_exception(type(what), value=what, tb=None)
     else:
         print("[DEBUG] %s" % what)
-
diff --git a/_kosmorro/dumper.py b/_kosmorro/dumper.py
index 24f38b7..eb77f19 100644
--- a/_kosmorro/dumper.py
+++ b/_kosmorro/dumper.py
@@ -1,21 +1,5 @@
 #!/usr/bin/env python3
 
-#    Kosmorro - Compute The Next Ephemerides
-#    Copyright (C) 2019  Jérôme Deuchnord <jerome@deuchnord.fr>
-#
-#    This program is free software: you can redistribute it and/or modify
-#    it under the terms of the GNU Affero General Public License as
-#    published by the Free Software Foundation, either version 3 of the
-#    License, or (at your option) any later version.
-#
-#    This program is distributed in the hope that it will be useful,
-#    but WITHOUT ANY WARRANTY; without even the implied warranty of
-#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-#    GNU Affero General Public License for more details.
-#
-#    You should have received a copy of the GNU Affero General Public License
-#    along with this program.  If not, see <https://www.gnu.org/licenses/>.
-
 from abc import ABC, abstractmethod
 import datetime
 import json
@@ -447,8 +431,7 @@ class _LatexDumper(Dumper):
                 continue
 
             latex.append(
-                r"\event{%s}{%s}"
-                % (event.start_time.strftime(TIME_FORMAT), event_name)
+                r"\event{%s}{%s}" % (event.start_time.strftime(TIME_FORMAT), event_name)
             )
 
         return "".join(latex)
diff --git a/_kosmorro/environment.py b/_kosmorro/environment.py
index 18542c3..c199bad 100644
--- a/_kosmorro/environment.py
+++ b/_kosmorro/environment.py
@@ -1,21 +1,5 @@
 #!/usr/bin/env python3
 
-#    Kosmorro - Compute The Next Ephemerides
-#    Copyright (C) 2019  Jérôme Deuchnord <jerome@deuchnord.fr>
-#
-#    This program is free software: you can redistribute it and/or modify
-#    it under the terms of the GNU Affero General Public License as
-#    published by the Free Software Foundation, either version 3 of the
-#    License, or (at your option) any later version.
-#
-#    This program is distributed in the hope that it will be useful,
-#    but WITHOUT ANY WARRANTY; without even the implied warranty of
-#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-#    GNU Affero General Public License for more details.
-#
-#    You should have received a copy of the GNU Affero General Public License
-#    along with this program.  If not, see <https://www.gnu.org/licenses/>.
-
 import os
 import re
 from pathlib import Path
diff --git a/_kosmorro/exceptions.py b/_kosmorro/exceptions.py
index 88ae9b8..4ad9711 100644
--- a/_kosmorro/exceptions.py
+++ b/_kosmorro/exceptions.py
@@ -1,21 +1,5 @@
 #!/usr/bin/env python3
 
-#    Kosmorro - Compute The Next Ephemerides
-#    Copyright (C) 2019  Jérôme Deuchnord <jerome@deuchnord.fr>
-#
-#    This program is free software: you can redistribute it and/or modify
-#    it under the terms of the GNU Affero General Public License as
-#    published by the Free Software Foundation, either version 3 of the
-#    License, or (at your option) any later version.
-#
-#    This program is distributed in the hope that it will be useful,
-#    but WITHOUT ANY WARRANTY; without even the implied warranty of
-#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-#    GNU Affero General Public License for more details.
-#
-#    You should have received a copy of the GNU Affero General Public License
-#    along with this program.  If not, see <https://www.gnu.org/licenses/>.
-
 from datetime import date
 from _kosmorro.i18n.utils import _, SHORT_DATE_FORMAT
 
diff --git a/_kosmorro/i18n/strings.py b/_kosmorro/i18n/strings.py
index 28eea01..f52067e 100644
--- a/_kosmorro/i18n/strings.py
+++ b/_kosmorro/i18n/strings.py
@@ -10,7 +10,14 @@ def from_event(event: Event, with_description: bool = True) -> str:
         EventType.OPPOSITION: (_("%s is in opposition"), None),
         EventType.CONJUNCTION: (_("%s and %s are in conjunction"), None),
         EventType.OCCULTATION: (_("%s occults %s"), None),
-        EventType.MAXIMAL_ELONGATION: (_("Elongation of %s is maximal"),  ('{:.3n}°'.format(event.details['deg']) if type(event.details) is dict else event.details)),
+        EventType.MAXIMAL_ELONGATION: (
+            _("Elongation of %s is maximal"),
+            (
+                "{:.3n}°".format(event.details["deg"])
+                if type(event.details) is dict
+                else event.details
+            ),
+        ),
         EventType.MOON_PERIGEE: (_("%s is at its perigee"), None),
         EventType.MOON_APOGEE: (_("%s is at its apogee"), None),
     }.get(event.event_type)
@@ -21,7 +28,7 @@ def from_event(event: Event, with_description: bool = True) -> str:
     string = string % tuple([from_object(o.identifier) for o in event.objects])
 
     if details is not None and with_description:
-        return '%s (%s)' % (string, details)
+        return "%s (%s)" % (string, details)
 
     return string
 
diff --git a/_kosmorro/i18n/utils.py b/_kosmorro/i18n/utils.py
index b65d525..18fb36a 100644
--- a/_kosmorro/i18n/utils.py
+++ b/_kosmorro/i18n/utils.py
@@ -1,21 +1,5 @@
 #!/usr/bin/env python3
 
-#    Kosmorro - Compute The Next Ephemerides
-#    Copyright (C) 2019  Jérôme Deuchnord <jerome@deuchnord.fr>
-#
-#    This program is free software: you can redistribute it and/or modify
-#    it under the terms of the GNU Affero General Public License as
-#    published by the Free Software Foundation, either version 3 of the
-#    License, or (at your option) any later version.
-#
-#    This program is distributed in the hope that it will be useful,
-#    but WITHOUT ANY WARRANTY; without even the implied warranty of
-#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-#    GNU Affero General Public License for more details.
-#
-#    You should have received a copy of the GNU Affero General Public License
-#    along with this program.  If not, see <https://www.gnu.org/licenses/>.
-
 import gettext
 import os
 
diff --git a/_kosmorro/locales/messages.pot b/_kosmorro/locales/messages.pot
index e1260f7..031ef18 100644
--- a/_kosmorro/locales/messages.pot
+++ b/_kosmorro/locales/messages.pot
@@ -8,7 +8,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: kosmorro 0.10.1\n"
 "Report-Msgid-Bugs-To: EMAIL@ADDRESS\n"
-"POT-Creation-Date: 2021-06-20 16:08+0200\n"
+"POT-Creation-Date: 2021-06-20 16:49+0200\n"
 "PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
 "Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
 "Language-Team: LANGUAGE <LL@li.org>\n"
@@ -27,76 +27,76 @@ msgid ""
 "offset format."
 msgstr ""
 
-#: _kosmorro/dumper.py:111
+#: _kosmorro/dumper.py:95
 msgid "Expected events:"
 msgstr ""
 
-#: _kosmorro/dumper.py:118
+#: _kosmorro/dumper.py:102
 msgid "Note: All the hours are given in UTC."
 msgstr ""
 
-#: _kosmorro/dumper.py:125
+#: _kosmorro/dumper.py:109
 msgid "Note: All the hours are given in the UTC{offset} timezone."
 msgstr ""
 
-#: _kosmorro/dumper.py:193 _kosmorro/dumper.py:323
+#: _kosmorro/dumper.py:177 _kosmorro/dumper.py:307
 msgid "Object"
 msgstr ""
 
-#: _kosmorro/dumper.py:194 _kosmorro/dumper.py:324
+#: _kosmorro/dumper.py:178 _kosmorro/dumper.py:308
 msgid "Rise time"
 msgstr ""
 
-#: _kosmorro/dumper.py:195 _kosmorro/dumper.py:326
+#: _kosmorro/dumper.py:179 _kosmorro/dumper.py:310
 msgid "Culmination time"
 msgstr ""
 
-#: _kosmorro/dumper.py:196 _kosmorro/dumper.py:328
+#: _kosmorro/dumper.py:180 _kosmorro/dumper.py:312
 msgid "Set time"
 msgstr ""
 
-#: _kosmorro/dumper.py:224
+#: _kosmorro/dumper.py:208
 msgid "Moon phase is unavailable for this date."
 msgstr ""
 
-#: _kosmorro/dumper.py:228 _kosmorro/dumper.py:332
+#: _kosmorro/dumper.py:212 _kosmorro/dumper.py:316
 msgid "Moon phase:"
 msgstr ""
 
-#: _kosmorro/dumper.py:232
+#: _kosmorro/dumper.py:216
 msgid "{next_moon_phase} on {next_moon_phase_date} at {next_moon_phase_time}"
 msgstr ""
 
-#: _kosmorro/dumper.py:296
+#: _kosmorro/dumper.py:280
 msgid "Overview of your sky"
 msgstr ""
 
-#: _kosmorro/dumper.py:304
+#: _kosmorro/dumper.py:288
 msgid ""
 "This document summarizes the ephemerides and the events of {date}. It "
 "aims to help you to prepare your observation session. All the hours are "
 "given in {timezone}."
 msgstr ""
 
-#: _kosmorro/dumper.py:314
+#: _kosmorro/dumper.py:298
 msgid ""
 "Don't forget to check the weather forecast before you go out with your "
 "equipment."
 msgstr ""
 
-#: _kosmorro/dumper.py:321
+#: _kosmorro/dumper.py:305
 msgid "Ephemerides of the day"
 msgstr ""
 
-#: _kosmorro/dumper.py:330
+#: _kosmorro/dumper.py:314
 msgid "hours"
 msgstr ""
 
-#: _kosmorro/dumper.py:337
+#: _kosmorro/dumper.py:321
 msgid "Expected events"
 msgstr ""
 
-#: _kosmorro/dumper.py:492
+#: _kosmorro/dumper.py:475
 msgid ""
 "Building PDF was not possible, because some dependencies are not "
 "installed.\n"
@@ -104,7 +104,7 @@ msgid ""
 "pdf/ for more information."
 msgstr ""
 
-#: _kosmorro/dumper.py:545
+#: _kosmorro/dumper.py:528
 #, python-format
 msgid ""
 "An error occurred during the compilation of the PDF.\n"
@@ -112,114 +112,114 @@ msgid ""
 "share the content of the log file at /tmp/kosmorro-%s.log"
 msgstr ""
 
-#: _kosmorro/exceptions.py:34
+#: _kosmorro/exceptions.py:18
 msgid "The date must be between {minimum_date} and {maximum_date}"
 msgstr ""
 
-#: _kosmorro/main.py:62
+#: _kosmorro/main.py:46
 msgid ""
 "Save the planet and paper!\n"
 "Consider printing your PDF document only if really necessary, and use the"
 " other side of the sheet."
 msgstr ""
 
-#: _kosmorro/main.py:71
+#: _kosmorro/main.py:55
 msgid ""
 "PDF output will not contain the ephemerides, because you didn't provide "
 "the observation coordinates."
 msgstr ""
 
-#: _kosmorro/main.py:116
+#: _kosmorro/main.py:100
 msgid "The file could not be saved in \"{path}\": {error}"
 msgstr ""
 
-#: _kosmorro/main.py:130
+#: _kosmorro/main.py:114
 msgid "Please provide a file path to export in this format (--output)."
 msgstr ""
 
-#: _kosmorro/main.py:163
+#: _kosmorro/main.py:147
 msgid "Moon phase can only be displayed between {min_date} and {max_date}"
 msgstr ""
 
-#: _kosmorro/main.py:202
+#: _kosmorro/main.py:186
 msgid "Running on Python {python_version} with Kosmorrolib v{kosmorrolib_version}"
 msgstr ""
 
-#: _kosmorro/main.py:212
+#: _kosmorro/main.py:196
 msgid "Do you really want to clear Kosmorro's cache? [yN] "
 msgstr ""
 
-#: _kosmorro/main.py:220
+#: _kosmorro/main.py:204
 msgid "Incorrect answer, cache not cleared."
 msgstr ""
 
-#: _kosmorro/main.py:230
+#: _kosmorro/main.py:214
 msgid ""
 "Compute the ephemerides and the events for a given date and a given "
 "position on Earth."
 msgstr ""
 
-#: _kosmorro/main.py:233
+#: _kosmorro/main.py:217
 msgid ""
 "By default, only the events will be computed for today ({date}).\n"
 "To compute also the ephemerides, latitude and longitude arguments are "
 "needed."
 msgstr ""
 
-#: _kosmorro/main.py:247
+#: _kosmorro/main.py:231
 msgid "Show the program version"
 msgstr ""
 
-#: _kosmorro/main.py:255
+#: _kosmorro/main.py:239
 msgid "Delete all the files from Kosmorro's cache."
 msgstr ""
 
-#: _kosmorro/main.py:263
+#: _kosmorro/main.py:247
 msgid "The format to output the information to"
 msgstr ""
 
-#: _kosmorro/main.py:270
+#: _kosmorro/main.py:254
 msgid ""
 "The observer's latitude on Earth. Can also be set in the "
 "KOSMORRO_LATITUDE environment variable."
 msgstr ""
 
-#: _kosmorro/main.py:280
+#: _kosmorro/main.py:264
 msgid ""
 "The observer's longitude on Earth. Can also be set in the "
 "KOSMORRO_LONGITUDE environment variable."
 msgstr ""
 
-#: _kosmorro/main.py:290
+#: _kosmorro/main.py:274
 msgid ""
 "The date for which the ephemerides must be calculated. Can be in the "
 "YYYY-MM-DD format or an interval in the \"[+-]YyMmDd\" format (with Y, M,"
 " and D numbers). Defaults to today ({default_date})."
 msgstr ""
 
-#: _kosmorro/main.py:301
+#: _kosmorro/main.py:285
 msgid ""
 "The timezone to display the hours in (e.g. 2 for UTC+2 or -3 for UTC-3). "
 "Can also be set in the KOSMORRO_TIMEZONE environment variable."
 msgstr ""
 
-#: _kosmorro/main.py:310
+#: _kosmorro/main.py:294
 msgid "Disable the colors in the console."
 msgstr ""
 
-#: _kosmorro/main.py:317
+#: _kosmorro/main.py:301
 msgid ""
 "A file to export the output to. If not given, the standard output is "
 "used. This argument is needed for PDF format."
 msgstr ""
 
-#: _kosmorro/main.py:326
+#: _kosmorro/main.py:310
 msgid ""
 "Do not generate a graph to represent the rise and set times in the PDF "
 "format."
 msgstr ""
 
-#: _kosmorro/main.py:334
+#: _kosmorro/main.py:318
 msgid "Show debugging messages"
 msgstr ""
 
@@ -238,106 +238,106 @@ msgstr ""
 msgid "%s occults %s"
 msgstr ""
 
-#: _kosmorro/i18n/strings.py:13
+#: _kosmorro/i18n/strings.py:14
 #, python-format
 msgid "Elongation of %s is maximal"
 msgstr ""
 
-#: _kosmorro/i18n/strings.py:14
+#: _kosmorro/i18n/strings.py:21
 #, python-format
 msgid "%s is at its perigee"
 msgstr ""
 
-#: _kosmorro/i18n/strings.py:15
+#: _kosmorro/i18n/strings.py:22
 #, python-format
 msgid "%s is at its apogee"
 msgstr ""
 
-#: _kosmorro/i18n/strings.py:31
+#: _kosmorro/i18n/strings.py:38
 msgid "New Moon"
 msgstr ""
 
-#: _kosmorro/i18n/strings.py:32
+#: _kosmorro/i18n/strings.py:39
 msgid "Waxing Crescent"
 msgstr ""
 
-#: _kosmorro/i18n/strings.py:33
+#: _kosmorro/i18n/strings.py:40
 msgid "First Quarter"
 msgstr ""
 
-#: _kosmorro/i18n/strings.py:34
+#: _kosmorro/i18n/strings.py:41
 msgid "Waxing Gibbous"
 msgstr ""
 
-#: _kosmorro/i18n/strings.py:35
+#: _kosmorro/i18n/strings.py:42
 msgid "Full Moon"
 msgstr ""
 
-#: _kosmorro/i18n/strings.py:36
+#: _kosmorro/i18n/strings.py:43
 msgid "Waning Gibbous"
 msgstr ""
 
-#: _kosmorro/i18n/strings.py:37
+#: _kosmorro/i18n/strings.py:44
 msgid "Last Quarter"
 msgstr ""
 
-#: _kosmorro/i18n/strings.py:38
+#: _kosmorro/i18n/strings.py:45
 msgid "Waning Crescent"
 msgstr ""
 
-#: _kosmorro/i18n/strings.py:49
+#: _kosmorro/i18n/strings.py:56
 msgid "Sun"
 msgstr ""
 
-#: _kosmorro/i18n/strings.py:50
+#: _kosmorro/i18n/strings.py:57
 msgid "Moon"
 msgstr ""
 
-#: _kosmorro/i18n/strings.py:51
+#: _kosmorro/i18n/strings.py:58
 msgid "Mercury"
 msgstr ""
 
-#: _kosmorro/i18n/strings.py:52
+#: _kosmorro/i18n/strings.py:59
 msgid "Venus"
 msgstr ""
 
-#: _kosmorro/i18n/strings.py:53
+#: _kosmorro/i18n/strings.py:60
 msgid "Mars"
 msgstr ""
 
-#: _kosmorro/i18n/strings.py:54
+#: _kosmorro/i18n/strings.py:61
 msgid "Jupiter"
 msgstr ""
 
-#: _kosmorro/i18n/strings.py:55
+#: _kosmorro/i18n/strings.py:62
 msgid "Saturn"
 msgstr ""
 
-#: _kosmorro/i18n/strings.py:56
+#: _kosmorro/i18n/strings.py:63
 msgid "Uranus"
 msgstr ""
 
-#: _kosmorro/i18n/strings.py:57
+#: _kosmorro/i18n/strings.py:64
 msgid "Neptune"
 msgstr ""
 
-#: _kosmorro/i18n/strings.py:58
+#: _kosmorro/i18n/strings.py:65
 msgid "Pluto"
 msgstr ""
 
-#: _kosmorro/i18n/utils.py:27
+#: _kosmorro/i18n/utils.py:11
 msgid "{day_of_week} {month} {day_number}, {year}"
 msgstr ""
 
-#: _kosmorro/i18n/utils.py:30
+#: _kosmorro/i18n/utils.py:14
 msgid "{month} {day_number}, {hours}:{minutes}"
 msgstr ""
 
-#: _kosmorro/i18n/utils.py:33
+#: _kosmorro/i18n/utils.py:17
 msgid "{month} {day_number}, {year}"
 msgstr ""
 
-#: _kosmorro/i18n/utils.py:36
+#: _kosmorro/i18n/utils.py:20
 msgid "{hours}:{minutes}"
 msgstr ""
 
diff --git a/_kosmorro/main.py b/_kosmorro/main.py
index cfadae7..bd852c7 100644
--- a/_kosmorro/main.py
+++ b/_kosmorro/main.py
@@ -1,21 +1,5 @@
 #!/usr/bin/env python3
 
-#    Kosmorro - Compute The Next Ephemerides
-#    Copyright (C) 2019  Jérôme Deuchnord <jerome@deuchnord.fr>
-#
-#    This program is free software: you can redistribute it and/or modify
-#    it under the terms of the GNU Affero General Public License as
-#    published by the Free Software Foundation, either version 3 of the
-#    License, or (at your option) any later version.
-#
-#    This program is distributed in the hope that it will be useful,
-#    but WITHOUT ANY WARRANTY; without even the implied warranty of
-#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-#    GNU Affero General Public License for more details.
-#
-#    You should have received a copy of the GNU Affero General Public License
-#    along with this program.  If not, see <https://www.gnu.org/licenses/>.
-
 import argparse
 import locale
 import re
diff --git a/kosmorro b/kosmorro
index 7b10fe5..1d8936a 100755
--- a/kosmorro
+++ b/kosmorro
@@ -1,21 +1,5 @@
 #!/usr/bin/env python3
 
-#    Kosmorro - Compute The Next Ephemerides
-#    Copyright (C) 2019  Jérôme Deuchnord <jerome@deuchnord.fr>
-#
-#    This program is free software: you can redistribute it and/or modify
-#    it under the terms of the GNU Affero General Public License as
-#    published by the Free Software Foundation, either version 3 of the
-#    License, or (at your option) any later version.
-#
-#    This program is distributed in the hope that it will be useful,
-#    but WITHOUT ANY WARRANTY; without even the implied warranty of
-#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-#    GNU Affero General Public License for more details.
-#
-#    You should have received a copy of the GNU Affero General Public License
-#    along with this program.  If not, see <https://www.gnu.org/licenses/>.
-
 import sys
 import locale
 from _kosmorro.main import main
diff --git a/setup.py b/setup.py
index ee01c8f..25d2468 100644
--- a/setup.py
+++ b/setup.py
@@ -1,21 +1,5 @@
 #!/usr/bin/env python3
 
-#    Kosmorro - Compute The Next Ephemerides
-#    Copyright (C) 2019  Jérôme Deuchnord <jerome@deuchnord.fr>
-#
-#    This program is free software: you can redistribute it and/or modify
-#    it under the terms of the GNU Affero General Public License as
-#    published by the Free Software Foundation, either version 3 of the
-#    License, or (at your option) any later version.
-#
-#    This program is distributed in the hope that it will be useful,
-#    but WITHOUT ANY WARRANTY; without even the implied warranty of
-#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-#    GNU Affero General Public License for more details.
-#
-#    You should have received a copy of the GNU Affero General Public License
-#    along with this program.  If not, see <https://www.gnu.org/licenses/>.
-
 import pathlib
 from setuptools import setup, find_packages
 
@@ -30,8 +14,8 @@ setup(
     author="Jérôme Deuchnord",
     author_email="jerome@deuchnord.fr",
     url="http://kosmorro.space",
-    license="AGPL-3.0",
-    description="A program that computes the ephemerides.",
+    license="CeCILL-v2.1",
+    description="A program to compute the ephemerides.",
     long_description=README,
     long_description_content_type="text/markdown",
     keywords="kosmorro astronomy ephemerides ephemeris",