Category:Definitions/Equatorial Coordinate System

This category contains definitions related to Equatorial Coordinate System.
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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.