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abstraction > mathematical concept > number > quantity > coordinate component > equatorial coordinate component

equatorial coordinate component comparison table

Subject	has unit	is an instance of	has symbol	has definition
declination	angle unit	angle	δ	Angular distance north (+) or south (-) of the celestial equator to some object, measured in degrees, minutes, and seconds of arc along an hour circle passing through the object. Declination is analogous to latitude on the Earth's surface.
distance	length unit	length		The distance to a celestial object measured from the center of the Earth or Sun, in units of parsec or lightyear
right ascension	angle unit	angle	α	Angular 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.

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