a point in the heavens (on the celestial sphere)

the (usually elliptical) path described by one celestial body in its revolution about another

the branch of physics that studies celestial bodies and the universe as a whole

(astronomy) the point in an orbit closest to the body being orbited

apoapsis in Earth orbit; the point in its orbit where a satellite is at the greatest distance from the Earth

apoapsis in solar orbit; the point in the orbit of a planet or comet that is at the greatest distance from the sun

apoapsis in orbit around Jupiter

apoapsis in orbit around the moon

the (usually elliptical) path described by one celestial body in its revolution about another

the branch of physics that studies celestial bodies and the universe as a whole