explain why the stars we see in July are different from the stars we see in January
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That is because of the movement of stars and the rotation of of our earth. So the stars you see in July are different from those which you see in January. It also depends upon your location.
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The Earth has two major motions :- rotation and revolution.
The rotation of the Earth on its axis causes the movement of the stars across the sky and the revolution of the Earth around the Sun is responsible for the different parts of the sky we see at different parts of the year.
On a given day in January,you can see some particular stars.But if you wait 6 months(now,July), the Earth will be at the opposite on its orbit, and you will now be able to see those stars that you couldn't see 6 months earlier because they were blocked by the Sun and wont be able to see the earlier stars.
The rotation of the Earth on its axis causes the movement of the stars across the sky and the revolution of the Earth around the Sun is responsible for the different parts of the sky we see at different parts of the year.
On a given day in January,you can see some particular stars.But if you wait 6 months(now,July), the Earth will be at the opposite on its orbit, and you will now be able to see those stars that you couldn't see 6 months earlier because they were blocked by the Sun and wont be able to see the earlier stars.
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