moon_sighting

Lunar crescent visibility for Dart and Flutter. Computes moon phase, topocentric position, illumination, and Yallop/Odeh crescent visibility criteria using Meeus algorithms. Zero dependencies.

Uses Meeus lite algorithms with approximately 0.3 degree accuracy. The companion JavaScript package (moon-sighting on npm) uses JPL DE442S ephemeris for sub-arcminute precision.

Install

dependencies:
  moon_sighting: ^1.0.0

import 'package:moon_sighting/moon_sighting.dart';

final phase = getMoonPhase();
print('${phase.phaseName} (${phase.illumination.toStringAsFixed(1)}%)');

final vis = getMoonVisibilityEstimate(
  DateTime.utc(2025, 3, 31, 18, 30),
  21.4225, 39.8262, // Makkah
);
print('Zone: ${vis.zone.label}');
print('Visible naked eye: ${vis.isVisibleNakedEye}');

Quickstart Guide — install, first call, phase and position
Advanced Usage — visibility criteria, new moon finding
API Reference — full function and type reference
Examples — real-world snippets
Contributing

1.1 KiB Raw Blame History

moon_sighting

Install

Contents

1.1 KiB

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