Space & Astronomy

The Phases of the Moon

An easy explanation of why the Moon changes shape during the month and how people once used it as a calendar.

A26 min

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1The Moon is Earth's closest neighbour and our only natural satellite.

2It takes about one month to travel once around our planet.

3The Moon does not make its own light at all.

4We see it because sunlight shines on its grey surface.

5Sometimes we see a full, round Moon in the night sky.

6At other times, only half of the Moon looks bright.

7These changes are called the phases of the Moon.

8Long ago, people used the Moon to count days and months.

9Many old calendars still follow the cycle of the Moon.

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