The earth rotates about its own axis and also revolves around the sunStill why is it considered to be an inertial frame of reference?

Answer 1

I think you may be referring to the gyroscopic effect of the rotation of the Earth. As with any stable gyroscope, it is their stability that makes them a reliable reference.

The V1 ram jet buzz bombs of the war used a gyroscope to maintain a stable path. Violently upsetting the device by tipping the wing threw the gyroscope into chaos and caused them to drop short of their target. Gyroscopes rotate at enormous speeds to achieve this stability and someone please correct me, but I believe 100,000 rpm is not unusual.

Mass and rotational velocity, totally devoid of gravitational influences. It is this which causes the Earth to maintain its angle of tilt, totally irrespective of its rotation around the Sun. It is interesting to compare the angles of tilt of the other planets as well.

The mystery to me is why most of the planets remain on the same plane as the Ecliptic.

Compared to the various angles of tilt, that stability is remarkable and fairly obviously an influence deriving from the Sun.

An interesting study but without ONCE mentioning the spinning planet, but wait, how stupid of me, that's what the gyroscopic effect of the rotation of the Earth is.

Answer 2

From the direction from west to east... it is not exactly 24 hrs it rotates from its axis, its rotation time is 23hrs. 56mins and 4.09 sec....... no, 1 rotation is equals to 1 day.. while 1 revolution is equals to 365 days(not exactly too) the revolution time of the earth around the sun is 365 days 5hrs 48min and 46 sec or 365 and one-fourth days...