README.md

@@ -3,11 +3,8 @@
 [![pub package](https://img.shields.io/pub/v/moon_sighting.svg)](https://pub.dev/packages/moon_sighting)
 [![CI](https://github.com/acamarata/moon-sighting-dart/actions/workflows/ci.yml/badge.svg)](https://github.com/acamarata/moon-sighting-dart/actions/workflows/ci.yml)
 [![License: MIT](https://img.shields.io/badge/license-MIT-blue.svg)](LICENSE)
-[![Wiki](https://img.shields.io/badge/docs-wiki-blue)](https://github.com/acamarata/moon-sighting-dart/wiki)
 
-Lunar crescent visibility for Dart and Flutter. Moon phase, topocentric position, illumination, and Yallop/Odeh crescent criteria using Meeus algorithms. Zero dependencies.
+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 (~0.3 degree accuracy). The companion TypeScript package (`moon-sighting` on npm) uses JPL DE442S ephemeris for sub-arcminute precision.
 
 ## Installation
 
@@ -25,16 +22,18 @@ import 'package:moon_sighting/moon_sighting.dart';
 final phase = getMoonPhase();
 print('${phase.phaseName} ${phase.phaseSymbol}');
 print('Illumination: ${phase.illumination.toStringAsFixed(1)}%');
+print('Age: ${phase.age.toStringAsFixed(1)} hours');
 
 // Moon position for an observer
 final pos = getMoonPosition(DateTime.now(), 51.5074, -0.1278, elevation: 10);
 print('Azimuth: ${pos.azimuth.toStringAsFixed(1)}');
 print('Altitude: ${pos.altitude.toStringAsFixed(1)}');
+print('Distance: ${pos.distance.toStringAsFixed(0)} km');
 
 // Crescent visibility estimate (pass a post-sunset time)
 final vis = getMoonVisibilityEstimate(
   DateTime.utc(2025, 3, 31, 18, 30),
-  21.4225, 39.8262, // Makkah
+  21.4225, 39.8262, // Mecca
 );
 print('Zone: ${vis.zone.label}'); // A through D
 print('Visible naked eye: ${vis.isVisibleNakedEye}');
@@ -42,33 +41,124 @@ print('Visible naked eye: ${vis.isVisibleNakedEye}');
 
 ## API
 
-Five public functions. See the [API Reference](https://github.com/acamarata/moon-sighting-dart/wiki/API-Reference) for full field tables.
+### getMoonPhase([DateTime? date])
 
-| Function | Returns | Description |
+Returns `MoonPhaseResult` with:
+
+| Field | Type | Description |
 | --- | --- | --- |
-| `getMoonPhase([DateTime?])` | `MoonPhaseResult` | Phase name, illumination, age, next events |
+| `phase` | `MoonPhaseName` | Enum: newMoon, waxingCrescent, firstQuarter, etc. |
-| `getMoonPosition(DateTime?, lat, lon)` | `MoonPosition` | Topocentric az/alt, distance |
+| `phaseName` | `String` | Human-readable name |
-| `getMoonIllumination([DateTime?])` | `MoonIlluminationResult` | Fraction, phase cycle, bright limb angle |
+| `phaseSymbol` | `String` | Moon emoji |
-| `getMoonVisibilityEstimate(DateTime?, lat, lon)` | `MoonVisibilityEstimate` | Odeh V parameter, visibility zone A-D |
+| `illumination` | `double` | Percent illuminated (0-100) |
-| `getMoon(DateTime?, lat, lon)` | `MoonSnapshot` | All four results combined |
+| `age` | `double` | Hours since last new moon |
+| `elongationDeg` | `double` | Moon-Sun elongation in degrees |
+| `isWaxing` | `bool` | True when illumination is increasing |
+| `nextNewMoon` | `DateTime` | Next new moon (UTC) |
+| `nextFullMoon` | `DateTime` | Next full moon (UTC) |
+| `prevNewMoon` | `DateTime` | Previous new moon (UTC) |
+
+### getMoonPosition(DateTime? date, double lat, double lon, {double elevation = 0})
+
+Returns `MoonPosition` with:
+
+| Field | Type | Description |
+| --- | --- | --- |
+| `azimuth` | `double` | Degrees from North, clockwise |
+| `altitude` | `double` | Degrees above horizon (refraction applied) |
+| `distance` | `double` | Earth-Moon distance in km |
+| `parallacticAngle` | `double` | Parallactic angle in radians |
+
+### getMoonIllumination([DateTime? date])
+
+Returns `MoonIlluminationResult` with:
+
+| Field | Type | Description |
+| --- | --- | --- |
+| `fraction` | `double` | Illuminated fraction (0-1) |
+| `phase` | `double` | Phase cycle (0=new, 0.25=Q1, 0.5=full, 0.75=Q3) |
+| `angle` | `double` | Bright limb position angle (radians) |
+| `isWaxing` | `bool` | True when waxing |
+
+### getMoonVisibilityEstimate(DateTime? date, double lat, double lon, {double elevation = 0})
+
+Returns `MoonVisibilityEstimate` with:
+
+| Field | Type | Description |
+| --- | --- | --- |
+| `v` | `double` | Odeh V parameter |
+| `zone` | `OdehZone` | Visibility zone (a through d) |
+| `description` | `String` | Zone description |
+| `isVisibleNakedEye` | `bool` | True for zone A |
+| `isVisibleWithOpticalAid` | `bool` | True for zones A and B |
+| `arcl` | `double` | Sun-Moon elongation (degrees) |
+| `arcv` | `double` | Arc of vision (degrees) |
+| `w` | `double` | Crescent width (arc minutes) |
+| `moonAboveHorizon` | `bool` | Moon above horizon at given time |
+
+### getMoon(DateTime? date, double lat, double lon, {double elevation = 0})
+
+Returns `MoonSnapshot` combining all four results: `phase`, `position`, `illumination`, `visibility`.
+
+## Visibility Criteria
+
+The Odeh criterion (2006) classifies crescent visibility into four zones:
+
+| Zone | V threshold | Meaning |
+| --- | --- | --- |
+| A | V >= 5.65 | Visible with naked eye |
+| B | V >= 2.00 | Visible with optical aid, may be seen naked eye |
+| C | V >= -0.96 | Visible with optical aid only |
+| D | V < -0.96 | Not visible even with optical aid |
+
+The Yallop q-test (1997) uses six categories A through F with different threshold semantics. Both criteria use the same underlying polynomial for the minimum arc of vision as a function of crescent width.
 
 ## Accuracy
 
-All positions use Meeus (1998) approximations: Moon longitude < 0.3 deg, latitude < 0.2 deg, distance ~300 km. New/full moon times are within ~2 hours.
+All positions use Meeus (1998) approximations:
+
+- **Sun:** < 0.01 deg ecliptic longitude error
+- **Moon:** < 0.3 deg longitude, < 0.2 deg latitude
+- **Distance:** ~300 km error (~0.08%)
+- **New/full moon times:** within ~2 hours
+
+The GCRS-to-topocentric conversion uses a simplified Earth rotation (ERA only, no nutation/precession), adding ~1 deg systematic error. This is acceptable for phase displays, illumination calculations, and approximate visibility estimates.
+
+For high-precision crescent sighting reports with DE442S ephemeris accuracy, see the TypeScript [moon-sighting](https://github.com/acamarata/moon-sighting) package.
+
+## Lite Mode vs Full Mode
+
+This Dart package implements lite mode only. It covers moon phase, position, illumination, and quick visibility estimates using analytical Meeus algorithms with no external data files.
+
+The full-mode features (DE442S JPL ephemeris, sub-arcsecond accuracy, rise/set event finding, best-time optimization, full sighting reports) are available in the TypeScript package.
+
+## Architecture
+
+Two-mode design: lite mode uses Jean Meeus Chapters 47 and 48 for moon phase, position, and illumination: zero dependencies, no file I/O, works in any Dart environment. The GCRS-to-topocentric conversion applies ERA-only Earth rotation (no full nutation/precession), which introduces a ~1 degree systematic error acceptable for display and quick-estimate use cases.
+
+Full-mode features (DE442S ephemeris, sub-arcsecond accuracy, rise/set event finding) are in the TypeScript [moon-sighting](https://github.com/acamarata/moon-sighting) package.
+
+## Compatibility
+
+- Dart SDK >= 3.7.0
+- Works in Flutter, Dart CLI, and server-side Dart
+- Zero runtime dependencies
 
 ## Related
 
-- [moon-sighting](https://github.com/acamarata/moon-sighting) (TypeScript) - Full accuracy with DE442S ephemeris
+- [moon-sighting](https://github.com/acamarata/moon-sighting) (TypeScript) - Full-accuracy lunar crescent visibility with DE442S ephemeris
-- [nrel-spa](https://github.com/acamarata/nrel-spa) (TypeScript) - NREL Solar Position Algorithm
+- [nrel-spa](https://github.com/acamarata/nrel-spa) (TypeScript) - Pure JS NREL Solar Position Algorithm
-- [pray-calc](https://github.com/acamarata/pray-calc) (TypeScript) - Islamic prayer times
+- [pray-calc](https://github.com/acamarata/pray-calc) (JavaScript) - Islamic prayer time calculation
+- [luxon-hijri](https://github.com/acamarata/luxon-hijri) (TypeScript) - Hijri/Gregorian calendar conversion
 
 ## Acknowledgments
 
-Crescent visibility criteria from:
+Crescent visibility criteria implemented from:
 
 - B.D. Yallop, "A Method for Predicting the First Sighting of the New Crescent Moon," NAO Technical Note No. 69, 1997.
 - M.Sh. Odeh, "New Criterion for Lunar Crescent Visibility," Experimental Astronomy 18(1), 39-64, 2006.
-- Jean Meeus, "Astronomical Algorithms," 2nd ed., Chapters 47 and 48.
+
+Meeus positions from: Jean Meeus, "Astronomical Algorithms," 2nd ed., Chapters 47 and 48.
 
 ## License
 

pubspec.yaml

@@ -7,6 +7,7 @@ version: 1.0.0
 homepage: https://github.com/acamarata/moon-sighting-dart
 repository: https://github.com/acamarata/moon-sighting-dart
 issue_tracker: https://github.com/acamarata/moon-sighting-dart/issues
+publisher: ariccamarata.com
 topics:
   - moon
   - lunar