How is time calculated?
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The year is divided into 12 months, which roughly correspond with the time it takes for the Moon to complete one full orbit of the Earth.
The Earth rotates about its axis once every 24 hours (top). It also orbits around the Sun, taking a year to complete the orbit (middle). At the same time, the Moon orbits the Earth in about 28 days, and this measurement is used to describe a month (bottom).
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Date Added: 13 December '11
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