Module spa 

SPA (Solar Position Algorithm) implementation.

High-accuracy solar positioning based on the NREL algorithm by Reda & Andreas (2003). Provides uncertainties of ±0.0003 degrees for years -2000 to 6000.

Modules

coefficients

SPA algorithm coefficient tables.

Functions

solar_position

Calculate solar position using the SPA algorithm.

solar_position_no_refraction

Calculate solar position using the SPA algorithm without refraction correction.

sunrise_sunset

Calculate sunrise, solar transit, and sunset times using the SPA algorithm.

sunrise_sunset_for_horizon

Calculate sunrise, solar transit, and sunset times for a specific horizon type.

sunrise_sunset_multiple

Calculate sunrise/sunset times for multiple horizons efficiently.