Category:Horizontal Coordinate System

This category contains results about Horizontal Coordinate System.
Definitions specific to this category can be found in Definitions/Horizontal Coordinate System.

The horizontal coordinate system is an astronomical coordinate system in which measurements are based on the celestial horizon.

Hence a point on the celestial sphere is located by means of $2$ angular measurements:

the azimuth $A$, which is the angular distance measured eastwards along the celestial horizon from the north point

the altitude $h$, which is the angular distance measured north or south of the celestial horizon.