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Qu'est-ce (qui) est apsis - définition
EXTREME POINT IN AN OBJECT'S ORBIT
Aphelion; Apogee; Perihelion and aphelion; Perigee; Apoapsis; Apsides; Apolune; Perilune; Periapsis; Apojove; Perijove; Pericenter; Apocenter; Perizene; Periastron; Perimelasma; Perihermion; Pericytherion; Periselene; Periareion; Perikrone; Periuranion; Periposeidion; Perihadion; Apastron; Apomelasma; Aphermion; Apocytherion; Aposelene; Apoareion; Apozene; Apokrone; Apuranion; Apoposeidion; Aphadion; Periapsis distance; Apoapsis distance; Apoastron; Apapsis; Perihelia; Apihelion; Perinigricon; Aponigricon; Apocynthion; Periapse; Apogeum; Perigeum; Periphelion; Perigalacticon; Perigree; Closest approach; Galacticon; Perihelion distance; Apoapse; Apo-apsis; Perihelion; Perigalactic; Apogalactic; Aphelion and perihelion; Peribothron; Apobothron; Periselenum; Aphelion distance; Pericentre; Cynth; Closest Approach; Terran perihelion
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![Diagram of a body's direct [[orbit]] around the [[Sun]] with its nearest (perihelion) and farthest (aphelion) points.](https://commons.wikimedia.org/wiki/Special:FilePath/Perihelion-Aphelion.svg?width=200 "Diagram of a body's direct [[orbit]] around the [[Sun]] with its nearest (perihelion) and farthest (aphelion) points.")
![The perihelion (green) and aphelion (orange) points of the [[inner planets]] of the Solar System](https://commons.wikimedia.org/wiki/Special:FilePath/Inner Planet Orbits 02.svg?width=200 "The perihelion (green) and aphelion (orange) points of the [[inner planets]] of the Solar System")
![The perihelion (green) and aphelion (orange) points of the [[outer planets]] of the Solar System](https://commons.wikimedia.org/wiki/Special:FilePath/Outer Planet Orbits 02.svg?width=200 "The perihelion (green) and aphelion (orange) points of the [[outer planets]] of the Solar System")
apsis
['aps?s]
¦ noun (plural apsides -di:z) Astronomy either of the two points in a body's orbit that are nearest to or furthest from the larger body round which it moves.
Derivatives
apsidal adjective
Origin
C17: via L. from Gk apsis, hapsis 'arch, vault'.
Apsis
·noun ·same·as Apse.
II. Apsis ·noun In a curve referred to polar coordinates, any point for which the radius vector is a maximum or minimum.
III. Apsis ·noun One of the two points of an orbit, as of a planet or satellite, which are at the greatest and least distance from the central body, corresponding to the aphelion and perihelion of a planet, or to the apogee and perigee of the moon. The more distant is called the higher apsis; the other, the lower apsis; and the line joining them, the line of apsides.
Aphelion
·noun That point of a planet's or comet's orbit which is most distant from the sun, the opposite point being the perihelion.
Wikipédia
Apsis
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An apsis (from Ancient Greek ἁψίς (hapsís) 'arch, vault'; PL apsides AP-sih-deez) is the farthest or nearest point in the orbit of a planetary body about its primary body. For example, for orbits about the Sun the apsides are called aphelion (farthest) and perihelion (nearest).
