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abstraction > mathematical concept > number > quantity > angle > elongation

elongation
subject			fact

elongation	has elongation
	is a kind of angle
angle	has unit angle unit
number	has value

Kinds of elongation :

• planetary elongation (19 kinds, 60 facts) - The geocentric angle between a planet and the Sun, measured in the plane of the planet, Earth and Sun. Planetary elongations are measured from 0° to 180°, east or west of the Sun., The 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.
• satellite elongation (2 facts) - The geocentric angle between a satellite and its primary, measured in the plane of the satellite, planet and Earth. Satellite elongations are measured from 0° east or west of the planet.