pvlib.solarposition.declination_spencer71#
- pvlib.solarposition.declination_spencer71(dayofyear)[source]#
Solar declination from Duffie & Beckman and attributed to Spencer (1971) and Iqbal (1983).
See [1] for details.
Warning
Return units are radians, not degrees.
- Parameters:
dayofyear (numeric)
- Returns:
declination (radians) (numeric) – Angular position of the sun at solar noon relative to the plane of the equator, approximately between +/-23.45 (degrees).
References
See also