In our solar system, Jupiters spins fastest of all planets - just under 10 hours to complete a revolution (one day).
Pluto, but its now no longer classed as a planet - its a `Dwarf Planet`
The axis
The axis
The imaginary line around which a planet spins is called its axis. It is an invisible line that runs from the planet's north pole to its south pole and determines the direction of rotation.
Jupiter spins the third fastest on its axis, with a day lasting about 9.9 hours.
When a planet spins on its axis it is said to rotate. (Think of a top.)
The rotational period, or how fast a planet spins on its axis, determines the length of a day on that planet. A faster spin results in shorter days, while a slower spin leads to longer days.
How long it spins on it's axis
Neptune
Venus is the only planet in our solar system that spins clockwise on its axis. This is also known as a retrograde rotation.
Well the earth spins counter clockwise on its axis.
-- If a planet spins, then it has a spin axis. -- If it has a spin axis, then it has poles. -- An equator is just the line made up of all the points that are midway between the poles. So if the planet has poles, then it has an equator. -- Mercury spins.