SPA: Solar Position Algorithm
Abstract
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.
- Publication:
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Astrophysics Source Code Library
- Pub Date:
- April 2015
- Bibcode:
- 2015ascl.soft04002R
- Keywords:
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- Software