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

planetary elongation event
subject			fact

planetary elongation event	has definition A point in the orbit of a celestial body with a specific planetary elongation such as 0°, 90° or 180°
	is a kind of celestial event
	is a kind of planetary elongation
elongation	has elongation
event	has duration
	has synonym world point
	has time of occurrence
angle	has unit angle unit
number	has value

Kinds of planetary elongation event :

• conjunction (14 kinds, 43 facts) - The phenomenon in which two bodies have the same apparent celestial longitude (see longitude, celestial) or right ascension as viewed from a third body. Conjunctions are usually tabulated as geocentric phenomena. For Mercury and Venus, geocentric inferior conjunction occurs when the planet is between the Earth and Sun, and superior conjunction occurs when the Sun is between the planet and Earth.
• greatest elongation (4 facts) - The instants when the geocentric angular distances of Mercury or Venus are at a maximum from the Sun.
• opposition (4 facts) - Occurs when the Earth comes directly between that planet and the Sun; it can thus only happen in relation to the superior planets and the asteroids., A configuration of the Sun, Earth and a planet in which the apparent geocentric longitude of the planet differs by 180 degrees from the apparent geocentric longitude of the Sun.
• quadrature (3 facts) - Elongation of a planet when it makes a 90° angle with the Sun as seen from Earth. (b) A configuration in which two celestial bodies have apparent longitudes (see longitude, celestial) that differ by 90° as viewed from a third body. Quadratures are usually tabulated with respect to the Sun as viewed from the center of the Earth.