1
Rotation
A spinning motion.
2
Rotation Axis
The line on which an object rotates.
3
Orbit
The path an object follows as it moves around another object.
4
Revolution
The motion of one object around another.
5
Solstice
A day when Earth's rotation axis is most toward or away from the Sun.
6
Equinox
A day when Earth's rotation axis is leaning along Earth's orbit. Neither toward nor away from the Sun.