# Changelog

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).

## [1.1.0] - 2026-04-16

### Added

- `Moon` dataclass representing a natural satellite with `rotation_hours`, `orbital_hours`, `hours_per_sol`, `sols_per_year`, `is_tidally_locked`, `discovery_date`, `contact_date`
- 14 moons across 5 planets: Phobos, Deimos (Mars); Io, Europa, Ganymede, Callisto (Jupiter); Titan, Enceladus (Saturn); Miranda, Ariel, Umbriel, Titania, Oberon (Uranus); Triton (Neptune)
- `Body.__getitem__` — access moons by index, e.g. `Body.MARS[0]` returns Phobos
- Tidally locked moons have `sols_per_year == 1` (one sol = one orbit around parent planet)
- `Body.display_name` property for consistent name access across `Body` and `Moon`
- `get_epoch_date` extended to handle `Moon` (reads `discovery_date` / `contact_date` directly from the dataclass)
- `PlanetaryTime.from_earth` and all internals accept `Body | Moon`
- Titan has contact epoch (Huygens probe, 2005-01-14)
- `py.typed` marker — package is now PEP 561 compliant
- Full pytest test suite for `Moon` and `PlanetaryTime` with moons

### Changed

- `PlanetaryTime.body` return type widened to `Body | Moon`
- `__str__` and `__repr__` use `display_name` instead of `.value` to support both planets and moons
- `pyproject.toml` — added `description`, `license`, `keywords`, `classifiers`
- `README.md` — rewritten with full usage examples, body tables, and logging docs
- `LICENSE` — MIT license file added
- `poetry.lock` added to `.gitignore` (library — consumers pin their own dependencies)

## [1.0.0] - 2026-04-16

### Added

- `Body` enum with all 7 classic Solar System planets (Mercury, Venus, Mars, Jupiter, Saturn, Uranus, Neptune)
- `Body.rotation_hours` — sidereal rotation period in Earth hours
- `Body.orbital_hours` — orbital period around the Sun in Earth hours
- `Body.hours_per_sol` — rotation period rounded to nearest Earth hour
- `Body.sols_per_year` — number of sols in one planetary year
- `EpochType` enum with two modes: `DISCOVERY` and `CONTACT`
- Discovery dates for all 7 bodies (first telescopic observation or transit)
- Contact dates for Mercury (MESSENGER 2011), Venus (Venera 7 1970), Mars (Viking 1 1976); remaining bodies have no contact yet
- `PlanetaryTime` class representing a moment in time on a specific planetary body
- `PlanetaryTime.from_earth(earth_dt, body, epoch_type)` factory method
- Properties: `year`, `sol`, `hour`, `minute`, `second`, `body`, `epoch_type`
- `__str__` output format: `Year {y}, Sol {s}, HH:MM:SS ({Body} / {epoch} epoch)`
- `__repr__` for debugging
- Exception hierarchy: `PlanetaryTimeError` (base), `EpochUnavailableError`, `DatetimePrecedesEpochError`
- Naive datetimes are treated as UTC
- Loguru-based debug/info logging
- Full pytest test suite for `Body` and `PlanetaryTime`