Add Body.EARTH with Luna moon and switch Body indexing to 1-based

CHANGELOG.md

@@ -5,6 +5,18 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [1.3.1] - 2026-04-22
+
+### Added
+
+- `Body.EARTH` enum value with `rotation_hours = 23.934`, `orbital_hours = 8766.0`, discovery epoch 1543-01-01 (Copernicus), contact epoch 1969-07-20 (Apollo 11)
+- `Luna` moon (Earth's Moon): tidally locked, `rotation_hours = orbital_hours = 655.72`, discovery epoch 1609-11-01 (Galileo), contact epoch 1969-07-20 (Apollo 11)
+- `LUNA` constant exported from `moon.py`
+
+### Changed
+
+- `Body.__getitem__` now uses 1-based indexing — `Body.MARS[1]` returns Phobos, `Body.MARS[2]` returns Deimos
+
 ## [1.3.0] - 2026-04-21
 
 ### Added

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "planetarytime"
-version = "1.3.0"
+version = "1.3.1"
 description = "Python library for representing and working with time on other bodies in the Solar System"
 authors = [
     {name = "Jan Doubravský", email = "jan.doubravsky@gmail.com"}

src/planetarytime/_data.py

@@ -5,6 +5,7 @@ from datetime import date
 PLANET_ROWS: list[tuple[str, float, float, date, date | None]] = [
     ('Mercury'   ,   1407.600,    2111.2800, date(1631, 11,  7), date(2011,  3, 18)),
     ('Venus'     ,   5832.500,    5392.8000, date(1610,  1,  1), date(1970, 12, 15)),
+    ('Earth'     ,     23.934,    8766.0000, date(1543,  1,  1), date(1969,  7, 20)),
     ('Mars'      ,     24.600,   16487.2800, date(1610,  1,  1), date(1976,  7, 20)),
     ('Jupiter'   ,      9.900,  103982.1600, date(1610,  1,  7), None),
     ('Saturn'    ,     10.700,  258221.2800, date(1610,  7, 25), None),
@@ -14,6 +15,7 @@ PLANET_ROWS: list[tuple[str, float, float, date, date | None]] = [
 
 # (name, rotation_hours, orbital_hours, is_tidally_locked, discovery_date, contact_date | None)
 MOON_ROWS: list[tuple[str, float, float, bool, date, date | None]] = [
+    ('Luna'      ,  655.720,  655.720, True , date(1609, 11,  1), date(1969,  7, 20)),
     ('Phobos'    ,    7.653,    7.653, True , date(1877,  8, 18), None),
     ('Deimos'    ,   30.312,   30.312, True , date(1877,  8, 12), None),
     ('Io'        ,   42.456,   42.456, True , date(1610,  1,  8), None),

src/planetarytime/body.py

@@ -11,6 +11,7 @@ from planetarytime.moon import (
     EUROPA,
     GANYMEDE,
     IO,
+    LUNA,
     MIRANDA,
     Moon,
     OBERON,
@@ -27,6 +28,7 @@ class Body(Enum):
 
     MERCURY = "Mercury"
     VENUS = "Venus"
+    EARTH = "Earth"
     MARS = "Mars"
     JUPITER = "Jupiter"
     SATURN = "Saturn"
@@ -58,8 +60,8 @@ class Body(Enum):
         return self.value
 
     def __getitem__(self, index: int) -> Moon:
-        """Return the moon at the given index for this body."""
+        """Return the moon at the given 1-based index for this body."""
-        return _MOONS[self][index]
+        return _MOONS[self][index - 1]
 
 
 _ROTATION_HOURS: dict[Body, float] = {
@@ -74,6 +76,7 @@ _ORBITAL_HOURS: dict[Body, float] = {
 _MOONS: dict[Body, list[Moon]] = {
     Body.MERCURY: [],
     Body.VENUS:   [],
+    Body.EARTH:   [LUNA],
     Body.MARS:    [PHOBOS, DEIMOS],
     Body.JUPITER: [IO, EUROPA, GANYMEDE, CALLISTO],
     Body.SATURN:  [TITAN, ENCELADUS],

src/planetarytime/moon.py

@@ -56,6 +56,7 @@ _MOONS_BY_NAME: dict[str, Moon] = {
     row[0]: _make_moon(*row) for row in MOON_ROWS
 }
 
+LUNA     = _MOONS_BY_NAME["Luna"]
 PHOBOS   = _MOONS_BY_NAME["Phobos"]
 DEIMOS   = _MOONS_BY_NAME["Deimos"]
 IO       = _MOONS_BY_NAME["Io"]