Sandia’s Ephemeris Model

Sandia National Laboratories has developed a function that approximates the position of the sun quite accurately.  This function, along with Matlab source code, is available as part of the PV_LIB Toolbox.  The function is pvl_ephemeris.  The calculation is based on an internal course, Engineering Astronomy, developed by Grover Hughes, and documents in these class notes  Engineering-Astronomy.pdf (5143 downloads) .