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86db6c6bae
* feat: gap-fill API surface parity with nrel-spa JS (v1.0.1) Add formatTime, calcSpa, SpaFormattedResult, SpaFormattedAnglesResult, functionCode parameter for getSpa (spaZa/spaZaInc/spaZaRts/spaAll), incidence field on SpaResult, and export all function code constants. All 48 tests pass including numerical cross-validation against the NREL SPA reference date (Golden CO, 2003-10-17) and surface incidence angle. * docs: add CHANGELOG.md for v1.0.1 release * chore: polish pubspec, fix unused import, add wiki docs
34 lines
998 B
Markdown
34 lines
998 B
Markdown
# nrel_spa
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NREL Solar Position Algorithm for Dart and Flutter. Calculates solar zenith, azimuth, sunrise, sunset, and solar noon for any location and time. Pure Dart, zero dependencies, accurate to ±0.0003 degrees.
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Based on Reda & Andreas (2004), NREL/TP-560-34302.
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## Install
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```yaml
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dependencies:
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nrel_spa: ^1.0.1
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```
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```dart
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import 'package:nrel_spa/nrel_spa.dart';
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final result = getSpa(
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DateTime.utc(2024, 3, 15, 17, 0, 0),
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40.7128, // latitude
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-74.0060, // longitude
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-5.0, // UTC offset (EST)
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);
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print('Zenith: ${result.zenith.toStringAsFixed(4)}°');
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print('Sunrise: ${result.sunrise.toStringAsFixed(4)} h');
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```
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## Contents
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- [Quickstart Guide](guides/quickstart) — install, first call, common patterns
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- [Advanced Usage](guides/advanced) — custom zenith angles, elevation, atmospheric correction
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- [API Reference](API-Reference) — full function and type reference
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- [Examples](examples/basic-usage) — real-world snippets
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- [Contributing](CONTRIBUTING)
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