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​The Moon

The moon appears to be the brightest of all other celestial objects after the Sun. You can see the whole of the moon on a full-moon day. The moon will not be visible to us on the fifteenth day known as the new-moon day. The shape of the moon changes everyday. On the day next to the new-moon day, only a crescent of the moon appears. It increases gradually till on the fifteenth day when we can see the whole of the moon. These are known as the phases of moon. The lunar phase changes as the Moon orbits the Earth and different portions of its surface are illuminated by the Sun.



How are you able to see the moon?


It is because it reflects the light of the Sun. The Moon doesn't produce its own light, but looks bright because it reflects light from the Sun. Think of the Sun as a light bulb, and the Moon as a mirror, reflecting light from the light bulb.


The moon revolves around the Earth and also around the Sun along with the Earth. On a full-moon day the Earth lies in between the moon and the Sun. On a new-moon day the light of the Sun falls on the side of the moon which is facing away from the earth and hence is not visible to us.


The moon completes one revolution around the earth in 27.3 day. In the meantime, the Earth moves ahead in its orbit. Thus, from the Earth, the moon appears to complete one revolution between one new-moon day and the next , in 29.5 days. You know that a lunar eclipse may occur on some full-moon days.

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