apsis /ˈapsɪs/

a

I. noun


[Astronomy] either of two points on the orbit of a planet or satellite that are nearest to or furthest from the body round which it moves.
– origin early 17th cent. (denoting the orbit of a planet): via Latin from Greek apsis, hapsis ‘arch, vault’, perhaps from haptein ‘fasten, join’. Compare with apse.

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