periapsis

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English[edit]

Etymology[edit]

peri- +‎ apsis

Noun[edit]

periapsis (plural periapsides)

  1. (astronomy) The point of a body's elliptical orbit about the system's centre of mass where the distance between the body and the centre of mass is at its minimum.

Usage notes[edit]

In the case of some particular celestial bodies, specialised terms are used.

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