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