apsis

Etymology

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

noun

  1. (architecture) A recess or projection, with a dome or vault, at the east end of a church; an apse.
  2. (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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