Definitions for "Orbital plane"
Keywords:  plane, pluto, astronomy, moon, sun
A plane containing at least two masses orbiting around a common center of mass. The Earth and the Sun orbit each other in an orbital plane, as do the Earth and the Moon. However, the Earth-Moon orbital plane is tilted relative to the Earth-Sun orbital plane at a five-degree angle.
A plane containing at least two masses orbiting around a common center of gravity. Earth and Sun orbit each other in an orbital plane, as do Earth and Moon. However, the Earth-Moon orbital plane crosses the Earth-Sun orbital plane at a five-degree angle. See also: orbital period
The flat surface that would result if every point on the orbit of a body was connected to the center of its primary.