|This is the direction of a celestial object, measured clockwise
around the observer's horizon from north. So an object due north
has an azimuth of 0°, one due east 90°, south 180° and west
270°. Azimuth and altitude are usually used together to give the
direction of an object in the topocentric coordinate system.
Sometimes, south is used as the starting point for azimuth
angles instead of north, but on the Heavens-Above web site,
north is always the origin. We sometimes include the nearest
compass direction as an abbreviation to help clarify the azimuth
angles value in degrees. Up to three letters are used and they
represent azimuth angles in the following order; N (0°), NNE
(22.5°), NE (45°), ENE (67.5°), E (90°), ESE (112.5°), SE
(135°), SSE (157.5°), S (180°), SSW (202.5°), SW (225°), WSW
(247.5°), W (270°), WNW (292.5°), NW (315°), NNW (337.5°)