Computes the declination of the Sun for a given Julian Day.
Declination in degrees and decimal fraction.
Javier G. Corripio
Meeus, J. 1999. Astronomical Algorithms. Willmann-Bell, Richmond, Virginia, USA.
Reda, I. and Andreas, A. 2003. Solar Position Algorithm for Solar Radiation Applications. 55 pp.; NREL Report No. TP-560-34302, Revised January 2008. https://www.nrel.gov/docs/fy08osti/34302.pdf
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