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Solar Position Algorithm (SPA)

National Renewable Energy Laboratory

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Technology Marketing Summary

This algorithm 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. (Reference: Reda, I.; Andreas, A., Solar Position Algorithm for Solar Radiation Applications, Solar Energy. Vol. 76(5), 2004; pp. 577-589).

Description

The Solar Position Algorithm consists of an algorithm implemented in C for solar radiation applications which calculates the solar zenith and azimuth angles for the years -2000 to 6000, with uncertainties of +/- 0.0003 degrees.

Benefits
  • High degree of accuracy
Applications and Industries
  • Solar Tracking Device Manufacturing
  • Solar Tracking Simulation Software
More Information

Technology is Copyrighted
See http://www.nrel.gov/midc/spa/

Technology Status
Development StageAvailabilityPublishedLast Updated
Development - Tested and validatedAvailable01/21/201002/02/2010

Contact NREL About This Technology

To: Jennifer Ramsey<jennifer.ramsey@nrel.gov>