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Moon Day and Year?
Posted by Alan

Why is the Moon's day and year the same length?

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1. Re: Moon Day and Year? — Mike Wills


1. Re: Moon Day and Year?
From Mike Wills

The Moon's day and year are the same length if you accept that:
  • a lunar day is the time it takes the Moon to rotate on its axis once with respect to the Sun;
  • a lunar year is the time it takes the Moon to orbit the Earth once.
It takes just over 29½ days for the Moon to rotate on its axis and it also takes the Moon just over 29½ day to orbit the Earth. This is also why the Moon always keeps its face towards the Earth and why you can never see the far side of the Moon from the Earth.

Also see:
The Moon and Its Phases
Upcoming & Recent Eclipses of the Sun and Moon
Science and Technology Messageboard
Lunar Book List

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