Apsis meaning

ăpsĭs
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(architecture) An apse.
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(astronomy) The point of greatest or least distance of the orbit of a celestial body from the center of mass of the system.
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That point in the elliptical orbit of the moon, a planet, etc. nearest to (lower apsis), or that farthest from (higher apsis), the gravitational focus point.
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In the path of an orbiting body, either of the two points at which it is closest to or farthest away from the body it is orbiting.
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(architecture) A recess or projection, with a dome or vault, at the east end of a church; an apse.
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(astronomy) Either of the points in the elliptical orbit of a planet or comet where it is closest or furthest from the sun; perihelion or aphelion; an apside.
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line of apsides
  • a line joining the lower and higher apsides, forming the major axis of the orbit
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Idioms and Phrasal Verbs

Origin of apsis

  • Late Latin from Latin arch, vault from Greek hapsis from haptein to fasten

    From American Heritage Dictionary of the English Language, 5th Edition

  • Via Latin apsis, from Ancient Greek ἁψίς (hapsis, “arch, vault”). See also apse.

    From Wiktionary