Category:Equatorial Coordinate System

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

The equatorial coordinate system is an astronomical coordinate system in which measurements are based on the celestial equator.

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

the right ascension $\alpha$, which is the angular distance measured eastwards along the celestial equator from the vernal equinox

the declination $\delta$, which is the angular distance measured north or south of the terrestrial equator.