PERIAPSIS

periapsis, point of periapsis

(noun) (astronomy) the point in an orbit closest to the body being orbited

Source: WordNet® 3.1

Etymology

Noun

periapsis (plural periapsides)

(astronomy) 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.

Usage notes

In the case of some particular celestial bodies, specialised terms are used.

Synonyms

• pericenter

Antonyms

• apoapsis

Source: Wiktionary

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