diff --git a/kosmorro/__main__.py b/kosmorro/__main__.py
index 197e315..63a03c9 100644
--- a/kosmorro/__main__.py
+++ b/kosmorro/__main__.py
@@ -68,10 +68,13 @@ def run():
         return -1
 
     position = None
-    if args.position not in [None, ""]:
-        position = get_position(args.position)
-    elif env_vars.position not in [None, ""]:
-        position = get_position(env_vars.position)
+    try:
+        if args.position not in [None, ""]:
+            position = get_position(args.position)
+        elif env_vars.position not in [None, ""]:
+            position = get_position(env_vars.position)
+    except ValueError as e:
+        print_stderr(colored(e.args[0], color="red", attrs=["bold"]))
 
     # if output format is not specified, try to use output file extension as output format
     if args.output is not None and output_format is None:
diff --git a/kosmorro/locales/messages.pot b/kosmorro/locales/messages.pot
index e2d2373..ca1e3e7 100644
--- a/kosmorro/locales/messages.pot
+++ b/kosmorro/locales/messages.pot
@@ -8,7 +8,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: PROJECT VERSION\n"
 "Report-Msgid-Bugs-To: EMAIL@ADDRESS\n"
-"POT-Creation-Date: 2025-11-09 11:42+0100\n"
+"POT-Creation-Date: 2025-11-11 11:06+0100\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"
@@ -17,86 +17,86 @@ msgstr ""
 "Content-Transfer-Encoding: 8bit\n"
 "Generated-By: Babel 2.17.0\n"
 
-#: kosmorro/__main__.py:89
+#: kosmorro/__main__.py:92
 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:97
+#: kosmorro/__main__.py:100
 msgid ""
 "PDF output will not contain the ephemerides, because you didn't provide "
 "the observation coordinates."
 msgstr ""
 
-#: kosmorro/__main__.py:115
+#: kosmorro/__main__.py:118
 msgid ""
 "Environment variable KOSMORRO_TIMEZONE is deprecated. Use TZ instead, "
 "which is more standard."
 msgstr ""
 
-#: kosmorro/__main__.py:124
+#: kosmorro/__main__.py:127
 #, python-brace-format
 msgid "Unknown timezone: {timezone}"
 msgstr ""
 
-#: kosmorro/__main__.py:167
+#: kosmorro/__main__.py:170
 #, python-brace-format
 msgid "The file could not be saved in \"{path}\": {error}"
 msgstr ""
 
-#: kosmorro/__main__.py:181
+#: kosmorro/__main__.py:184
 msgid "Please provide a file path to export in this format (--output)."
 msgstr ""
 
-#: kosmorro/__main__.py:213
+#: kosmorro/__main__.py:216
 #, python-brace-format
 msgid "Moon phase can only be computed between {min_date} and {max_date}"
 msgstr ""
 
-#: kosmorro/__main__.py:264
+#: kosmorro/__main__.py:267
 #, python-brace-format
 msgid "Running on Python {python_version} with Kosmorrolib v{kosmorrolib_version}"
 msgstr ""
 
-#: kosmorro/__main__.py:277
+#: kosmorro/__main__.py:280
 msgid ""
 "Compute the ephemerides and the events for a given date and a given "
 "position on Earth."
 msgstr ""
 
-#: kosmorro/__main__.py:280
+#: kosmorro/__main__.py:283
 msgid ""
 "By default, only the events will be computed for today.\n"
 "To compute also the ephemerides, latitude and longitude arguments are "
 "needed."
 msgstr ""
 
-#: kosmorro/__main__.py:292
+#: kosmorro/__main__.py:295
 msgid "Show the program version"
 msgstr ""
 
-#: kosmorro/__main__.py:301
+#: kosmorro/__main__.py:304
 msgid ""
 "The output format. If not provided, it will be inferred from the file "
 "extension of the output file."
 msgstr ""
 
-#: kosmorro/__main__.py:310
+#: kosmorro/__main__.py:313
 msgid ""
 "The observer's position on Earth, in the \"latitude,longitude\" format. "
 "Can also be set in the KOSMORRO_POSITION environment variable."
 msgstr ""
 
-#: kosmorro/__main__.py:320
+#: kosmorro/__main__.py:323
 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 current date."
 msgstr ""
 
-#: kosmorro/__main__.py:331
+#: kosmorro/__main__.py:334
 msgid ""
 "The timezone to use to display the hours. It can be either a number (e.g."
 " 1 for UTC+1) or a timezone name (e.g. Europe/Paris). See "
@@ -104,29 +104,29 @@ msgid ""
 " timezone. Can also be set in the TZ environment variable."
 msgstr ""
 
-#: kosmorro/__main__.py:340
+#: kosmorro/__main__.py:343
 msgid "Disable the colors in the console."
 msgstr ""
 
-#: kosmorro/__main__.py:347
+#: kosmorro/__main__.py:350
 msgid "Use this option to save the result in a file."
 msgstr ""
 
-#: kosmorro/__main__.py:354
+#: kosmorro/__main__.py:357
 msgid ""
 "Do not generate a graph to represent the rise and set times in the LaTeX "
 "or PDF file."
 msgstr ""
 
-#: kosmorro/__main__.py:361
+#: kosmorro/__main__.py:364
 msgid "Show debugging messages"
 msgstr ""
 
-#: kosmorro/__main__.py:369
+#: kosmorro/__main__.py:372
 msgid "Print a script allowing completion for your shell"
 msgstr ""
 
-#: kosmorro/__main__.py:379
+#: kosmorro/__main__.py:382
 msgid "No completion script available for this shell."
 msgstr ""