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Apsides

   Also found in: Encyclopedia, Wikipedia, Hutchinson 0.09 sec.
ap·sis  (pss)
n. pl. ap·si·des (-s-dz)
1. Architecture An apse.
2. Astronomy The point of greatest or least distance of the orbit of a celestial body from a center of attraction.
[Late Latin, from Latin, arch, vault, from Greek hapsis, from haptein, to fasten.]
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In planets the latter motion is called precession of perihelion; in stars it is either precession of periastron or precession of apsides.
DI Hercules relates to relativity by Science News
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