diff --git a/kosmorrolib/__init__.py b/kosmorrolib/__init__.py
index f7d603c..74a65dc 100644
--- a/kosmorrolib/__init__.py
+++ b/kosmorrolib/__init__.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python3
 
-from .ephemerides import get_ephemerides
+from .data import Position
+from .ephemerides import get_ephemerides, get_moon_phase
 from .events import get_events
diff --git a/kosmorrolib/data.py b/kosmorrolib/data.py
index 93a372e..1fb5507 100644
--- a/kosmorrolib/data.py
+++ b/kosmorrolib/data.py
@@ -220,7 +220,7 @@ ASTERS = [
 
 
 class Position:
-    def __init__(self, latitude: float, longitude: float, aster: Object):
+    def __init__(self, latitude: float, longitude: float, aster: Object = EARTH):
         self.latitude = latitude
         self.longitude = longitude
         self.aster = aster
diff --git a/kosmorrolib/ephemerides.py b/kosmorrolib/ephemerides.py
index c81f561..d19cc3c 100644
--- a/kosmorrolib/ephemerides.py
+++ b/kosmorrolib/ephemerides.py
@@ -60,7 +60,7 @@ def _get_skyfield_to_moon_phase(
     )
 
 
-def get_moon_phase(compute_date: datetime.date, timezone: int = 0) -> MoonPhase:
+def get_moon_phase(compute_date: datetime.date = datetime.date.today(), timezone: int = 0) -> MoonPhase:
     earth = get_skf_objects()["earth"]
     moon = get_skf_objects()["moon"]
     sun = get_skf_objects()["sun"]
@@ -99,7 +99,7 @@ def get_moon_phase(compute_date: datetime.date, timezone: int = 0) -> MoonPhase:
 
 
 def get_ephemerides(
-    date: datetime.date, position: Position, timezone: int = 0
+    position: Position, date: datetime.date = datetime.date.today(), timezone: int = 0
 ) -> [AsterEphemerides]:
     ephemerides = []
 
diff --git a/kosmorrolib/events.py b/kosmorrolib/events.py
index bfed981..86c70c6 100644
--- a/kosmorrolib/events.py
+++ b/kosmorrolib/events.py
@@ -213,7 +213,7 @@ def _search_moon_perigee(start_time: Time, end_time: Time, timezone: int) -> [Ev
     return events
 
 
-def get_events(date: date_type, timezone: int = 0) -> [Event]:
+def get_events(date: date_type = date_type.today(), timezone: int = 0) -> [Event]:
     """Calculate and return a list of events for the given date, adjusted to the given timezone if any.
 
     Find events that happen on April 4th, 2020 (show hours in UTC):