Module spa 

SPA algorithm implementation.

High-accuracy solar positioning based on the NREL algorithm by Reda & Andreas (2003). Accuracy: ±0.0003° for years -2000 to 6000.

Reference: Reda, I.; Andreas, A. (2003). Solar position algorithm for solar radiation applications. Solar Energy, 76(5), 577-589. DOI: http://dx.doi.org/10.1016/j.solener.2003.12.003

Modules

coefficients

SPA algorithm coefficient tables.

Structs

SpaTimeDependent

Time-dependent intermediate values from SPA calculation (steps 1-11).

Functions

solar_positionchrono

Calculate solar position using the SPA algorithm.

solar_position_from_julian

Calculate solar position from a Julian date.

spa_time_dependent_from_julian

Calculate time-dependent parts of SPA from a Julian date.

spa_time_dependent_partschrono

Extract expensive time-dependent parts of SPA calculation (steps 1-11).

spa_with_time_dependent_parts

Complete SPA calculation using pre-computed time-dependent parts (steps 12+).

sunrise_sunsetchrono

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

sunrise_sunset_for_horizonchrono

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

sunrise_sunset_multiplechrono

Calculate sunrise/sunset times for multiple horizons efficiently.

sunrise_sunset_utc

Calculate sunrise/sunset times without chrono dependency.

sunrise_sunset_utc_for_horizon

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