How many days are required by moon to complete one revolution around the earth?
A
20.2 days.
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B
25.1 days.
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C
27.3 days.
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D
33.5 days.
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Solution
The correct option is C27.3 days. The moon orbits around the earth and completes one revolution which is relative to stars in about 27.3 days. This period is called a sidereal month.