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abstraction > mathematical concept > number > quantity > angle > right ascension
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right ascension comparison table
Subject is an instance of has unit is a kind of has symbol is a component of has definition
angle angle unitquantity   
equatorial coordinate component  coordinate component equatorial coordinate 
right ascensionangleangle unit αequatorial coordinateAngular distance on the celestial sphere measured eastward along the celestial equator from the equinox to the hour circle passing through the celestial object. Right ascension is usually given in combination with declination.

Next angle: terrestrial latitude    Up: angle, equatorial coordinate component    Previous angle: pitch angle