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Dec26-09, 05:28 PM
P: 801
Quote Quote by croghan27 View Post
Thanks for that ... both terms seemed to be used interchangeably and I was being led astray.

The other question I have may be somewhat off the wall .... but as we sit on earth we are busy whurrling about in the motion that makes days, on top of that we are circulating about the sun, in the circuit that defines years. The sun is just one of the stars in a very mobile galaxy grandly twisting in 'space'. So we are moving in all direction at once when compared to just about any reference point.

What effect does all this motion have upon us relative to relativity?
All motion is relative to a defined reference frame or "reference point", like you say, so the effect of our motion relative to a particular reference frame would depend on the reference frame chosen.