Definition of "apsis"
noun:
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A recess or projection, with a dome or vault, at the east end of a church; an apse.
from Wiktionary, Creative Commons Attribution/Share-Alike License -
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.
from Wiktionary, Creative Commons Attribution/Share-Alike License
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