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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)
What else can I help you with?
How does the planets distance from the sun affect the length of a day?
Not at all. The planet's daily rotation is independent of its distance from the Sun.
What is true about all equinoxes?
Day and night are of equal length (practically the definition of equinox)
True or false the length of a planet's year increases as its distance from the sun increases?
True. The length of time that it takes to complete one orbit around the Sun is directly related to the distance of the orbit from the Sun.
Do the gas planets rotate slower or faster than earth?
Gas planets typically rotate faster than Earth. For example, Jupiter rotates the quickest with a day length of about 10 hours, Saturn has a day length of about 10.7 hours, Uranus about 17 hours, and Neptune about 16 hours. In comparison, Earth rotates once every 24 hours.
Do all planets in the Solar system have the same length of the year?
no
What planets length of the day is 9 hours?
Mercury.
What would you define the length of a planets day?
by the rotation of the planet
What is the suns length of day?
I think that the sun doesn't have any length of day, because of the heat and how the planets revolve around the sun.
What two planets have similar length of day?
Earth has a 24 hour day and Mars has a 25 hour day.
What is the planets length on the day?
23 Hours 57 Minutes and 14 Seconds
What is the difference of The rotational period of the inner and outer planets?
Rotational time of the planets is random (the length of the planet's day), but the outer planets do spin faster than the inner planets.
Is it true that at the equator day length does not change?
yes. All the way around the equator the day length doesn't change.
Do any planets have longer days or years?
No two planets in our solar system have the same length of day or length of year. Compared with Earth, these planets have longer years: Mars, Jupiter, Saturn, Uranus, Neptune. These have much longer days than Earth: Mercury and Venus. Mars has a day that's slightly longer than Earth's day. Depending on the particular definition of "day" that is used, two planets have a day that's longer than than that planet's year. They are Mercury (solar day) and Venus (sidereal day).
Which two planets have the closest length of day?
Earth and Mars. Earth's day is 24 hours, while Mars' day is 24 hours 37 minutes.
What is the relationship between earth day length and the distance from the sun?
There is no direct relationship between the rotation of a planet (which governs day length) and a planets distance from the sun. The nature of the planets spin is more to do with the formation of the system early on, by large impacts of the more numerous bodies that would have been around.
Why does the length of a day and year vary from planet to planet?
Some planets rotate faster or than others. Also the planets take different times to orbit the Sun.
How does the planets distance from the sun affect the length of a day?
Not at all. The planet's daily rotation is independent of its distance from the Sun.
