Conversion from Celestial Coordinate to Horizon Coordinates

Quantities Needed:

tan A = sin H / (cos H sin f - tan d cos f )

sin h = sin f sin d + cos f cos d cos H

To Use these relationships: So you see that one needs: If any one of these changes then the Altitude and Azimuth changes.
  1. Obviously if you change the celestial object, the a and d change
  2. If you move the observatory, Latitude and Longitude change
  3. The time is changing continuously

Reference: "Astronomical Algorithms" by Jean Meeus
Willmann-Bell , Richmond VA, 1991
L.Bogan Nov 2000