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
- 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