Apsis

The apsides indicate the nearest and furthest points of an orbiting body around its host.
(1) farthest
(3) focus
(2) nearest
apocenter
primary
pericenter
aphelion
Sun
perihelion
apastron
star
periastron
apogee
Earth
perigee

Keplerian orbital elements: point F is at the pericenter, point H is at the apocenter, and the red line between them is the line of apsides

An apsis (Greek:ἁψίς; plural apsides /ˈæpsᵻdiːz/, Greek: ἁψίδες) is an extreme point in an object's orbit. 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- (fromπερί (peri), meaning "near") and ap-, or apo- (fromἀπ(ό) (ap(ó)), meaning "away from") added to a reference to the thing being orbited.

单词	Galacticon
释义	Galacticon 英语百科 Apsis An apsis (Greek:ἁψίς; plural apsides /ˈæpsᵻdiːz/, Greek: ἁψίδες) is an extreme point in an object's orbit. 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- (fromπερί (peri), meaning "near") and ap-, or apo- (fromἀπ(ό) (ap(ó)), meaning "away from") added to a reference to the thing being orbited.
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Galacticon

Apsis