If we follow relativity to its logical conclusion, there is no way for us to know whether the earth is rotating, or the earth is stationary and the universe is revolving around the earth, or if perhaps both are revolving around some other point.
I understand enough about relativity to know that there is no such thing as “absolute velocity”. My question is, is there such thing as “absolute angular momentum” and can can it be measured? What is our absolute angular momentum?
Can I prove that I am revolving around the center of the earth, and that the universe is not revolving around me?
I brought up the Corriolis effect, saying that if the universe revolved around the earth, we wouldn’t expect such an effect on balistic objects. The said that if we take the earth as having no rotational momentum, the effects could be explained as the gravitational effects of the whole revolving universe on the balistic object.
There is a major difference between angular velocity and linear velocity. Using special relativity it is impossible to distingiush between two intertial referenct frame, i.e. frames moving with a constant velocity. When rotation occurs velocity is no longer constant. The direction of the velocity vector changes with time. This is in essence what causes the Corriolis effect. One of the consequences of general relativity is that it is impossible to distinguish between an accelerating reference frame and one being effected by a constant force (like gravity).
that is not the logical conclusion of relativity, I would of asked your friend, if the universe is revolving around the Earth not vice versa anything further than 1/2pi light days away from us would be travelling faster than the speed of light!
something that is rotating is undergoing acceleration which is absolute in special relativity and though it is relative in general relativty (though it’s not quite that simple), the two view points aren’t equivalent.