periapsis

名词 n.
中文释义

英文释义

名词 n.
  1. The point of a body's (elliptical) orbit in a 2-body gravitational system such that the distance between the two bodies (measured from their respective centres of mass) is at its minimum.
    — 1983, Richard O. Fimmel, Laurence Colin, Eric Burgess, Pioneer Venus, NASA SP-461, page 109, Figure 5-19. Sun-Venus-Orbiter geometry illustrates how the periapsis moves around the planet during the Venusian sidereal year to sample day and night hemispheres. Because the planet rotates in a retrograde direction, it takes more than one Venusian sidereal year for periapsis to move over all longitudes of the planet (as explained in text).
  2. The minimum distance between the two bodies in such a system.

词形变化

periapsides plural periapsises plural periapses plural

词汇关系

近义词
pericenter periapse
反义词
apoapsis
上位词
apsis
衍生词
argument of periapsis longitude of periapsis
相关词
periareion periastron peribothron pericenter pericentre pericynthion perigalacticon perigee perihelion perihermion perijove perikrone perikron perilune perimelasma perinigricon periposeidon perisaturnium periselene

词源

Etymology tree
Proto-Indo-European *per-der.
Ancient Greek περῐ́ (perĭ́)der.
English peri-
English apsis
English periapsis
From peri- + apsis.
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