apastron

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See also: Apastron

English[edit]

Etymology[edit]

A diagram illustrating the apastron between a star (the inner object) and a celestial object orbiting it.

From English apo- (prefix meaning ‘away from, separate’) + Ancient Greek ᾰ̓́στρον (ástron, fixed star), modelled after aphelion.[1] Ἄ̆στρον (Ástron) is derived from ᾰ̓στήρ (astḗr, celestial body (including a star, planet, meteor, etc.)) (ultimately from Proto-Indo-European *h₂eHs- (to burn; to glow)) + -ον (-on, suffix forming nominative, accusative and vocative singular nouns).

Pronunciation[edit]

Noun[edit]

apastron (plural apastrons)

  1. (astronomy) The point of greatest separation between a celestial object and the star which it orbits.
    Antonym: periastron

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Translations[edit]

References[edit]

  1. ^ apastron, n.”, in OED Online Paid subscription required, Oxford: Oxford University Press, December 2012; “apastron, n.”, in Lexico, Dictionary.com; Oxford University Press, 2019–present.

Further reading[edit]