Apsis Definition
ăpsĭs
apsides
noun
apsides
An apse.
American Heritage
That point in the elliptical orbit of the moon, a planet, etc. nearest to (lower apsis), or that farthest from (higher apsis), the gravitational focus point.
Webster's New World
The point of greatest or least distance of the orbit of a celestial body from the center of mass of the system.
American Heritage
Webster's New World
Synonyms:
idiom
line of apsides
- a line joining the lower and higher apsides, forming the major axis of the orbit
Webster's New World
Idioms, Phrasal Verbs Related to Apsis
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