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Q:

# How long does it take the moon to rotate on its axis?

A:

One lunar day, the length of time it takes the moon to complete a full rotation on its axis, is equivalent to 28 days on Earth. This is also the amount of time it takes for the moon to complete its orbit around the Earth.

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Due to the fact that the moon's rotational period and orbital period are both about 28 days, it deceivingly appears that the moon never rotates. This is the result of the Earth's gravity creating "tidal bulges" on the moon which maintain this slow rotation. Most other moons in the solar system are subject to the same tidal forces and, thus, always show the same face to the planet below.

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## Related Questions

• A:

It takes Venus as long as 243 Earth days to complete a full rotation on its own axis. That's quite a long time considering that one Earth day, or 24 hours, is the time it takes Earth to make a full rotation on its axis.

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• A:

The Earth's moon takes 27 Earth days to completely orbit the Earth. A day on the moon is also equal to a little over 27 days on Earth.

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It takes light from the moon's surface approximately 1.3 seconds to reach the Earth. This is also the amount of time it takes for sound to travel from the Earth to the moon. That means that communication from the Earth to an astronaut on the moon has a 2.6-second delay.