Define this term, please, or provide a link.
For the record, I seem to recall that we have the earth orbiting the Sun (close enough for govt. work, anyway, given the ratio of the two masses; and we can consider the effects of the moon and other planets as mere perturbations), in addtion to rotation of the earth about its own axis -- which is not perpendicular to the plane of its orbit about the sun.
To say that "the sun is also orbiting the earth" is misleading: this is not a two-body system of equivalent masses, the error introduced by treating the Sun as the center of mass is very small.
I think LG is confusion the aberration of light issue with the (approximate) two-body problem.
Cheers!
For the record, I seem to recall that we have the earth orbiting the Sun (close enough for govt. work, anyway,
Yes indeed. We have Copernicus to thank for that : )
To say that "the sun is also orbiting the earth" is misleading: this is not a two-body system of equivalent masses, the error introduced by treating the Sun as the center of mass is very small.
You misunderstood me. Let me make it clearer, the two models are equivalent, as illustrated by the merry go round animation, or the two people floating in space. It is understood that models are a gross simplification. The point that I am trying to make with mrjesse is that for a person standing on the equator of a large ball, there is no difference to him when he observes another ball, whether his ball is spinning or the other ball is orbiting his, or combination of spinning and orbiting. His observations will be the same.
It is essentially the same as two people floating in space with radar guns approaching each other. It is impossible for them to determine absolutely who is approaching whom. Either persons frame of reference is equivalent. It is only when you add something else for reference (like a space ship) that you can arbitrarily determine who is approaching whom.
I think LG is confusion the aberration of light issue with the (approximate) two-body problem.
I regret ever pointing out the aberration of light to mrjesse : (
It is also a two-body problem in an Einstein universe not a Galilean universe, because we are dealing with the speed of light, where time is also a variable.