Why does the moon come in different shapes? Detailed answer

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Why does the moon come in different shapes? Detailed answer

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Why does the moon come in different shapes?

The moon moves in orbit around the earth and makes a full circle in about a month. It also rotates on its axis and makes one revolution in 27 days, 7 hours and 43 minutes. Since the rotation around the Earth and its own axis takes almost the same time, the Moon is constantly turned to the Earth by one side. The moon does not shine on its own like the sun does. It only seems that it shines, but in fact the Moon reflects the light of the Sun. Since the Moon moves around the Earth, the Sun illuminates different parts of it.

Sometimes we see the full surface of the moon illuminated, and sometimes only part of it is illuminated. This makes one think that the Moon in the sky is changing its shape. These changes of the moon are called phases, which means that we only see different parts of the moon. The cycle of lunar phases begins with the young Moon. This happens when the Moon is between the Earth and the Sun. The young moon is not visible. Then the side of the Moon facing the Earth begins to be illuminated by the Sun.

The illuminated part looks like a thin, narrow slice of a circle. It is called the waxing moon. The solar part of the Moon grows rapidly and reaches a semicircle. This is called the first quarter. Then the surface of the moon is less and less illuminated and reaches the last quarter. So the cycle ends and is replaced by a new, young, growing moon. A full cycle from one young moon to another takes 29,5 days.

Author: Likum A.

Random interesting fact from the Great Encyclopedia:

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The Canadian province of Alberta contains the Great Slave Lake, the Little Slave Lake, and the Slave River, although there was no slavery or plantation in the area. All these names originated from the Slave Indian tribe who lived here, but changed due to confusion with the English word "slave", which means "slave".

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