nrel_spa 1.0.0

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, ±0.0003° accuracy.

Changelog

1.0.0 - 2026-03-08

Added

• getSpa() computes solar position for any date and location
• Custom zenith angle support for twilight calculations
• Full NREL SPA algorithm (Reda & Andreas, 2004)
• Accuracy: ±0.0003° for solar zenith angle
• Valid range: years -2000 to 6000
• Zero external dependencies