AZIMUTH&ELEVATION CALCULATIONS.

AZIMUTH calculation

      AZ=arcTan(-tan Wd/sin G)+180      ........... for  Northern Hemisphere



                                     (OR)


     AZ=arcTan(-tan Wd/sin G)            ..........        for  Southren Hemisphere   

Where
    
             Wd=Difference in Longitude between Earthstation and satellite.
                G= Great circle angle
                  =  arc cos (cos Wd X cos L)          L=earthstation lattitude.