Compass

I see many programs around allowing "simulating" a compass on a cellphone, just by specifying latitude and time. How do they work?
Which formula should I use to obtain sun azimut?

Sun_Az = f(latitude,longitude?,time)

http://www.jqjacobs.net/astro/astrofor_2.html

Have a look at that. Should give you most of the information you need.

Quote:

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Originally Posted by 03myersd

http://www.jqjacobs.net/astro/astrofor_2.html

Have a look at that. Should give you most of the information you need.

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many thanks.