Orbit around Earth has point {apogee} farthest from Earth.
Orbit around Earth has point {perigee} nearest Earth.
Orbit around Sun has point {aphelion} farthest from Sun.
Orbit around Sun has point {perihelion} nearest Sun.
At vernal equinox, Sun is at a celestial-sphere point {first point of Aries}.
For two objects in space, five points {Lagrangian point} {libration point} have equal competing gravities. Three are unstable, but two are stable.
5-Astronomy-Solar System-Orbit
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Date Modified: 2022.0225