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Months and years are measures of time based on astronomical phenomena. The month is based on the length of time it takes for the moon to return to a given phase, such as full moon to full moon. A year is based on the time it takes the earth to made one complete revolution of the sun.
It should be noted that these measurements may vary depending on which method is used. There are different 'kinds' of months and years.

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15y ago

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