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Searching for codes credited to 'Reda, Ibrahim'

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[ascl:1504.002] SPA: Solar Position Algorithm
Reda, Ibrahim; Andreas, Afshin
The Solar Position Algorithm (SPA) calculates the solar zenith and azimuth angles in the period from the year -2000 to 6000, with uncertainties of +/- 0.0003 degrees based on the date, time, and location on Earth. SPA is implemented in C; in addition to being available for download, an online calculator using this code is available at https://www.nrel.gov/midc/solpos/spa.html.