Roughly, the day. To be precise, the day also depends slightly on the planet's orbit around the Sun, but if the time it takes for a planet to rotate once is short, compared to the time of an orbit, it won't make much difference. For instance, a day on Earth is 24 hours; the time it takes Earth to rotate once is about 23 hours and 56 minutes.
One full rotation of any planet on its axis is the length of that planets day, Earth included.
A planet's rotation on its axis determines the length of its day.
The length of Saturn's rotation on its axis is about ten and a half hours.
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rotation
rotation
All planets turn on their axis. This is called the planet's rotation; one complete rotation is equal to one day on that planet.
A planet's axis of rotation is an imaginary line that runs through its center, around which the planet rotates. This axis is tilted relative to its orbital plane, which affects the planet's seasons and climate. For example, Earth's axis is tilted at about 23.5 degrees, leading to variations in sunlight exposure throughout the year. The rotation around this axis determines the length of a day on the planet.
It is called rotation.
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.
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.
A planet's turn on its axis is known as rotation. This movement causes the planet to spin around an imaginary line called its axis, which runs from the North Pole to the South Pole. The duration of one complete rotation determines the length of a day on that planet. For example, Earth takes approximately 24 hours to complete one rotation.