pvlib.solarposition.declination_spencer71¶
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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
[1] J. A. Duffie and W. A. Beckman, “Solar Engineering of Thermal Processes, 3rd Edition” pp. 13-14, J. Wiley and Sons, New York (2006) [2] J. W. Spencer, “Fourier series representation of the position of the sun” in Search 2 (5), p. 172 (1971) [3] Daryl R. Myers, “Solar Radiation: Practical Modeling for Renewable Energy Applications”, p. 4 CRC Press (2013) See also