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abstraction > mathematical concept > number > quantity > angle > celestial longitude
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celestial longitude comparison table
Subject is an instance of has unit is a kind of is a component of has definition
angle angle unitquantity  
ecliptic coordinate component  coordinate componentecliptic coordinate 
celestial longitudeangleangle unit ecliptic coordinateAngular distance on the celestial sphere measured eastward along the ecliptic from the dynamical equinox to the great circle passing through the poles of the ecliptic and the celestial object.

Next angledeclination    Upangle, ecliptic coordinate component    Previous anglecelestial latitude