One.
That is the definition of a rotation. Once around it's axis.
See related question for the periods
The period of rotation for each of the planets is as follows - the sidereal rotation (rotation time against background stars); PlanetSidereal rotational periodMercury58.646225Venus-243.0187Earth0.99726957Mars1.02595675Jupiter0.41007Saturn0.426Uranus-0.71833Neptune0.67125
Unlike their orbits around the sun - which was inherent in the way the planets were formed - their rotation speeds and axis of rotation is random and is dependent on each planet's history of collisions.
A planets rotation is dependent on the total number and direction of ALL the hits that it has taken since it initially formed.
The force that keeps all of our planets in rotation is gravity.
The order of the planets' rotation speeds from fastest to slowest is Jupiter, Saturn, Mars, Earth, Venus, Uranus, Neptune, and Mercury. This ranking is based on the time it takes for each planet to complete one rotation on its axis.
its rotation is opposite of all the other planets.
Yes, the sun and planets are attracted to each other through the force of gravity. The sun's massive gravity keeps the planets in orbit around it, while the planets also have gravitational effects on each other.
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rotation
Earth and Mars are the planets in this solar system with similar rotation speed of approximately 24 hr.
The dominant mode of rotation of planets, where they rotate counterclockwise on their axis as viewed from above the North Pole, is called prograde rotation.