Category:Definitions/Ecliptic Coordinate System

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The ecliptic coordinate system is an astronomical coordinate system in which measurements are based on the ecliptic.

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

the celestial longitude $\lambda$ is the angular distance measured eastwards along the ecliptic from the vernal equinox

the celestial latitude $\beta$ is the angular distance measured north or south of the ecliptic.