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29 lines
942 B
Markdown
29 lines
942 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.
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Accurate to +/- 0.0003 degrees. Based on Reda & Andreas (2004), NREL/TP-560-34302.
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## Quick Start
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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('Azimuth: ${result.azimuth.toStringAsFixed(4)}');
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print('Sunrise: ${result.sunrise.toStringAsFixed(4)} h');
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print('Solar Noon: ${result.solarNoon.toStringAsFixed(4)} h');
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print('Sunset: ${result.sunset.toStringAsFixed(4)} h');
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```
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## Pages
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- [API Reference](API-Reference): Full function and type reference
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- [Architecture](Architecture): Algorithm design and implementation notes
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