different between apastron vs apogee

English

Etymology

From English apo- (prefix meaning ‘away from, separate’) + Ancient Greek ???????? (ástron, “fixed star”), modelled after aphelion. ??????? (Ástron) is derived from ?????? (ast?r, “celestial body (including a star, planet, meteor, etc.)”) (ultimately from Proto-Indo-European *h?eHs- (“to burn; to glow”)) + -?? (-on, suffix forming nominative, accusative and vocative singular nouns).

Pronunciation

• (Received Pronunciation) IPA^(key): /æ?pæst?(?)n/
• (General American) IPA^(key): /æ?pæst??n/, [?-]
• Hyphenation: ap?as?tron

Noun

apastron (plural apastrons or apastra)

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

   Antonym: periastron

Alternative forms

• apoastron

Hypernyms

• apoapsis

Coordinate terms

Translations

References

Further reading

• apsis on Wikipedia.Wikipedia

Anagrams

• Pastrano

English

Etymology

From French apogée, from Latin apogaeum, apogeum, from Ancient Greek ???????? (apógeion, “away from Earth”), from ??? (apó, “away”) + ?? (gê, “Earth”).

Pronunciation

• IPA^(key): /?æ.p?.d?i/

Noun

apogee (plural apogees)

1. (astronomy) The point, in an orbit about the Earth, that is furthest from the Earth: the apoapsis of an Earth orbiter.
2. (astronomy, more generally) The point, in an orbit about any planet, that is farthest from the planet: the apoapsis of any satellite.
   • 1995, John H. Rogers, The Giant Planet Jupiter, Cambridge University Press, ?ISBN, page 335:

     Conjunctions of I and II [Io and Europa] occur when they are near perigee and apogee respectively; conjunctions of II and III [Europa and Ganymede] occur when II [Europa] is near perigee.

   • 2002, Serge Brunier, Solar System Voyage, Cambridge University Press, ?ISBN, page 36:

     The resolution of the images obtained by this American probe [Messenger] will depend on its altitude [above Mercury] at any one time: about ten meters at perigee (200km altitude), but only one 1 km at apogee (15000km).

   • 2010, Ruth Walker and Mary M. Shaffrey et al., Exploring Space: The High Frontier, Jones & Bartlett Learning, ?ISBN, page 129:

     [Nereid’s] apogee—farthest point from Neptune—is five times the distance of its perigee—its closest point.

3. (possibly archaic outside astrology) The point, in any trajectory of an object in space, where it is furthest from the Earth.
4. (figuratively) The highest point.
   • 2004 March 22, The New Yorker:

     The cult of the chief executive reached its apogee in the nineteen-nineties, a period when C.E.O.s seemed not so much to serve their companies as to embody them.

Synonyms

• (point in an orbit): apocenter, apoapsis, apsis
• (highest point or state): acme, culmination, pinnacle, zenith, climax
• See also Thesaurus:apex

Antonyms

• (a point in an orbit): periapsis
• (a point in an orbit around the Earth): perigee
• (highest point): nadir, perigee

  perigee is the etymological antonym (from Ancient Greek).

Related terms

• (astronomy): see apoapsis

Translations

Latin

Adjective

apog?e

1. vocative masculine singular of apog?us