How Long Is One Day on Other Planets?

When you think of a day, you normally think of one cycle of daytime to nighttime. That is called a solar day. On Earth, a solar day is around 24 hours. But, do you know that different planets have different number of hours in their days.

When you think of a day, you normally think of one cycle of daytime to nighttime. That is called a solar day. On Earth, a solar day is around 24 hours. However, Earth’s orbit is elliptical, meaning it’s not a perfect circle. That means some solar days on Earth are a few minutes longer than 24 hours and some are a few minutes shorter.

earth days are 23.934 hours long

Another way to measure a day is to count the amount of time it takes for a planet to completely spin around and make one full rotation. This is called a sidereal day. On Earth, a sidereal day is almost exactly 23 hours and 56 minutes.

We know how long an Earth day is, but how about the other planets in our solar system? How long does it take for those planets to spin one full rotation and how many number of hours each planet has?

PlanetDay Length
Mercury1,408 hours
Venus5,832 hours
Earth24 hours
Mars25 hours
Jupiter10 hours
Saturn11 hours
Uranus17 hours
Neptune16 hours

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