From Wikipedia, the free encyclopedia.
This article is about the astronomical term. In architecture, apsis is also the plural of apse
In astronomy, an apsis is the point of greatest or least distance of the elliptical orbit of a celestial body from a center of attraction. The point of closest approach is called the periapsis and the point of farthest approach is the apoapsis.
When the body the orbit is around is known, more specific names are often used.
|Body being orbited||Closest approach||Farthest approach|
|a black hole||perimelasma||apomelasma|