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Calculation AZ by equation

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Posts: 15
Dec 17th, 2009 at 1:04pm  

Im trying to make sure my ACU unit that controlls the dishpointing works perfect, so I am trying to use math in order to calculate the AZ pointing angle using the equation

A= 180 + arctan [ tan(S-N)/sinL ] where S is the satellite long, N the site long and L the site LAT (all in degrees)

My question is a bit simple for you I guess, in order to use this equation I need to have the LONG part in degrees west. How do I transform long from East to West?

i.e. In Athens we have LAT LONG 37 N 23 E

What would that be in degrees west ?

LAT LONG 37 N  (=?) W    ???

Im a bit confused on how to calculate this one


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Eric Johnston
Senior Member

Posts: 2109
Reply #1 - Dec 17th, 2009 at 9:28pm  
I suggest you input degrees west as negative and degrees east as positive.

Best regards, Eric.
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