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The movement of the Earth around the sun in its orbit is called revolution.

It takes 365 days and 6 hours (364 ¼ days) to complete one revolution.

Revolution of the Earth causes seasons.

Moon

The Moon is the Earth’s only natural satellite. The moon takes 27 ½ days
to complete one complete rotation around its axis. It

also takes the same time for the moon to complete

one complete revolution around the Earth.

The moon is round. It is dry and barren. It has no air

or water. It emits no light of its own, but shines as it

reflects the sunlight that falls on it.

The Moon
Phases of the Moon

The moon appears to change its shape every night. We only see a portion

of the moon, which is illuminated by sunlight. The other side is dark

and cannot be seen. As the days pass, the moon appears to shrink until

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