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abstraction > mathematical concept > number > quantity > coordinate component > equatorial coordinate component > distance
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distance comparison table
Subject is an instance of has unit is a kind of is a component of has definition
equatorial coordinate component  coordinate componentequatorial coordinate 
length length unitquantity  
distancelengthlength unit equatorial coordinateThe distance to a celestial object measured from the center of the Earth or Sun, in units of parsec or lightyear

Next equatorial coordinate componentright ascension    Upequatorial coordinate component, length    Previous equatorial coordinate componentdeclination