Answer on Astronomy | Astrophysics Question for hamid
For an observer at a fixed position on Earth, the rotation of the earth around its axis makes it appear as if the sky is revolving around the earth. In other words, if you are standing for long enough in a field at night, it looks like the sky is moving, not you. This motion is called "apparent diurnal motion." "Diurnal" means having to do with a day, in the sense of a 24-hour period.
The Earth is orbiting around the Sun, completing one orbit in just over 365 days. If you divide 24 hours by 365 days, you’ll see that you’re left with about 4 minutes per day. In other words, the Earth rotates on its axis, but it’s also orbiting around the Sun, so the Sun’s position in the sky catches up by 4 minutes each day. Such a rotation plays a special role in the seasons changing. We also see differences in distant stars position at winter and at summer, for example.
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