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Hi All,

Does anyone knows an algoritmh to calculate the sun position given the GPS coordinates and date?

The goal is build a solar tracker, the input is GPS (coordinates and date time). From this I can calculate the azimuth and inclination of solar panel. Using a electronic compass and a tilt sensor I can position the solar panel with precison. I have a C source with the algorithm, but since I dont have a lot o time to implement I ask if anyone have / know a pascal source.

Thanks in advance

Joaquim

Have you tried googling around? This is the 2nd result when entered "sun position" pascal:
http://celestrak.com/columns/v03n01

Hi Avra,
Thanks for your awnser. I did google around. And I did misss this one. This is not quite what I want, because it lacks the coordinates (latitude and logitude), but is a good starting point.

Joaquim

This is where you can find visual explanation of Latitude to ECI Conversion and Longitude to ECI Conversion:
http://celestrak.com/columns/v02n01

Code can be found here:
http://celestrak.com/software/satellite/sgp4-plb26a.zip

I hope that this will be enough for your task.

I have just poped up on this code. It can't be simpler then this:
http://www.avrfreaks.net/index...showinfo=1

Thanks Avra.

Long/Lat in Delphi instead of C:
http://delphiforfun.org/Programs/Solar_Position.htm
http://delphiforfun.org/Programs/astronomy.htm

Thanks AVRA !