Azimuth is the horizontal angular distance from a reference direction, either the southern or northern most point of the horizon.
Azimuth angle is defined as the horizontal pointing angle of the earth station antenna. For navigation purposes, azimuth angle is usually measured in clockwise direction in degrees from true north.
However for satellite earth stations in the northern hemisphere and satellite vehicles in geosynchronous orbits, azimuth angle is generally referenced to true south.
b) Elevation angle:
Elevation angle is the vertical angle formed between the direction of travel of electromagnetic
wave radiated from an earth station antenna pointing directly towards a satellite and horizontal plane.
The smaller the elevation angle , the greater the distance a propagated wave must pass through earth’s atmosphere.
If the angle of elevation is too small, and the wave travels through earth’s atmosphere is too long, the wave degrades the transmission quality.