different between periastron vs periapsis

English

Etymology

From Ancient Greek ???? (perí, “around”) + ?????? (ástron, “star”).

Pronunciation

• IPA^(key): /p????æst??n/

Noun

periastron (plural periastrons or periastra)

1. (astronomy) That point of the orbit of a celestial body which is closest to the star around which the body is orbiting.

Antonyms

• apastron

Related terms

• see periapsis

Anagrams

• Pretorians, patroniser, portainers, pretorians

English

Etymology

peri- +? apsis

Noun

periapsis (plural periapsides)

1. (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

Related terms

Translations

See also

• Apsis on Wikipedia.Wikipedia

Finnish

Pronunciation

• IPA^(key): /?peri?psis/, [?pe?ri??ps?is?]
• Rhymes: -?psis
• Syllabification: pe?ri?ap?sis

Noun

periapsis

1. (astronomy) periapsis

Declension