How fast does the earth revolve each day?

Answer 1

Do you mean how fast does the earth rotate? The Earth rotates once in a few minutes under a day (23 hours 56 minutes 04. 09053 seconds). This is called the sidereal period. The sidereal period is not exactly equal to a day because by the time the Earth has rotated once, it has also moved around the Sun, so it has to keep rotating for about another 4 minutes before the Sun seems to be back in the same place in the sky that it was in exactly a day before. As far as revolving around the sun, You can't measure the speed of an object by itself, it has to be measured relative to something else (this was one of Einstein's realizations).

If we ask the question, "How fast the Earth is moving?" we have to specify that we want the speed with respect to another object. Motion cannot be measured without a reference point. We can ask how fast the earth is moving with respect to its own axis, the Sun, the Milky Way Galaxy, or our Local Group of galaxies