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periapsis
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Definitions of periapsis in various dictionaries:
noun - (astronomy) the point in an orbit closest to the body being orbited
PERIAPSIS - An apsis (Greek: ; plural apsides , Greek: ) is an extreme point in the orbit of an object. The word comes via Latin from Greek and is cognate with ...
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The point of a body's elliptical orbit about the system's centre of mass where the distance between the body and the centre of mass is at its minimum. |
(astronomy) the point in as orbit closest to the body being orbited |
Periapsis description |
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An apsis (Greek: ; plural apsides , Greek: ) is an extreme point in the orbit of an object. The word comes via Latin from Greek and is cognate with apse. For elliptic orbits about a larger body, there are two apsides, named with the prefixes peri- (from (peri), meaning 'near') and ap-/apo- (from () (ap(ó)), meaning 'away from') added to a reference to the body being orbited.* For a body orbiting the Sun, the point of least distance is the perihelion (), and the point of greatest distance is the aphelion (). * The terms become periastron and apastron when discussing orbits around other stars. * For any satellite of Earth, including the Moon, the point of least distance is the perigee () and greatest distance the apogee. * For objects in lunar orbit, the point of least distance is the pericynthion () and the greatest distance the apocynthion (). Perilune and apolune are also used. * For an orbit around any barycenter, the terms periapsis and apoapsis (or apapsis) are used. Pericenter and apo |