Rotation
The spinning motion of a planet on its axis.
Axis
An imaginary line that passes through a planet’s center and its north and south poles, about which the planet rotates.
Revolution
The movement of an object around another object.
Orbit
The path of an object as it revolves around another object in space.
Soltice
Either of the two days of the year on which the sun reaches its greatest distance north or south of the equator.
Equinox
Either of the two days of the year on which neither hemisphere is tilted toward or away from the sun.