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The days on Earth are determined by our rotational period. On other planets the rotatinal speed is different, and other factors can make the "solar day" (sunrise to sunrise) very different.

Rotational periods (for the core if a gas giant):

Mercury: 58.646225 Earth days

Venus: 243.0187 Earth days

Earth: 0.99726968 Earth days

Mars: 1.02595675 Earth days

Jupiter: 0.41354 Earth days

Saturn: 0.44401 Earth days

Uranus: 0.71833 Earth days

Neptune: 0.67125 Earth days

These are the rotation periods or "sidereal days", given in Earth "solar days" (of 24 hours)

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Calculating the solar day length

The length of a planet's "day" is normally determined by its rotational speed, which varies and is fastest on the larger planets. For two inner planets, the rotation is so slow that the "solar day" (sunrise to sunrise) is determined primary by their revolution around the Sun. For Uranus, its tilt means that the day or night is determined by its 84 Earth year orbit around the Sun.

Mercury: solar day is 176 Earth days

rotates once every 58.6 Earth days - (day is twice the length of its year)

Venus : solar day is 116.75 Earth days

rotates once every 243 Earth days, east to west - (its year is 224 Earth days).

Earth: solar day is 24 hours

rotates once every 23.93 hours (Earth rotates 366.25 times a year)

Mars : solar day is 24.6 Earth hours

rotates once every 24.66 Earth hours (the much longer year means the number of rotations roughly equals the number of days)

Jupiter : solar day is 9.925 Earth hours

rotates once 9.925 earth hours -(the atmosphere in the equatorial regions takes only 9.84 hours to rotate - it is a gas planet and the clouds are not attached to the core below)

Saturn :solar day is 10.65 Earth hours

rotates once every 10.65 Earth hours - clouds in equatorial regions take only 10.23 hours to rotate)

Uranus : solar day is 42 Earth years

rotates once every 17.24 Earth hours - (the planet is tipped on its side - each pole spends 42 Earth years in sunlight or darkness)

Neptune : solar day is 12 to 18 Earth hours

rotates once every 16.1 hours (the gases of Neptune's atmosphere rotate fastest at the poles: 1.5 times faster than at the equator)

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Related Questions

What planets length of the day is 9 hours?

Mercury.


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What two planets have similar length of day?

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What is the planets length on the day?

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Is it true that at the equator day length does not change?

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What is the relationship between earth day length and the distance from the sun?

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Why does the length of a day and year vary from planet to planet?

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How does the planets distance from the sun affect the length of a day?

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