The earth's rotation and orbital motion is responsible for the days and nights on the planet. This movement is also responsible for the changes in the seasons.

The earth's orbital speed has no influence or effect on its rotation.

"Rotation" refers to an object's spinning motion about its own axis. "Revolution" refers the object's orbital motion around another object

period of rotation = day (24 hrs. only for Earth) orbital period = year (not 365.25 days only for Earth)

Another name for Earth rotation is diurnal motion or daily rotation.