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abstraction > mathematical concept > number > quantity > angle > elongation > planetary elongation > greatest elongation
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greatest elongation comparison table
Subject has definition has elongation has synonym is a kind of is an instance of
planetary elongationThe angle planet-Earth-Sun. Eastern elongations appear east of the Sun in the evening; western elongations, west of the Sun in the morning. An elongation of 0° is called conjunction; one of 180° is called opposition: and one of 90° is called quadrature.  elongation 
planetary elongation eventA point in the orbit of a celestial body with a specific planetary elongation such as 0°, 90° or 180° world pointplanetary elongation 
greatest elongationThe instants when the geocentric angular distances of Mercury or Venus are at a maximum from the Sun.variesworld pointplanetary elongation eventplanetary elongation

Next planetary elongationplanetary elongation event    Upplanetary elongation, planetary elongation event