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-- As Earth rotates on its axis, everything you see in the sky appears to make

a complete circle around the poles once a day.

-- As Earth revolves in its orbit around the sun, everything you see in the sky

appears to make a complete circle around the poles once a year, if you check

on them at the same time every night.

That's why we have so-called "Summer constellations" and "Winter constellations".

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10y ago
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9y ago

They appear to rise and set each day as though fixed on a big sphere that goes round and round in the sky. That was the old idea, but we now understand that it happens because the Earth rotates on its axis every 23 hours 56 minutes relative to the stars.

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9y ago

There is no exact reason why stars exist. Stars are balls of gasses that produce heat. Without the sun, which is a star, Earth would be uninhabitable.

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Q: Why do stars exist?
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The stars you see at night still exist.


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