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Re: [Phys-l] Absolute four-momentum of massless particles

Judging from your response then, George, it appears that two gyroscopes can fix one's rotation in three axes with respect to the distant stars. So I can suppose, somewhat unrealistically, that an aluminum ion beam "atomic" clock of the Boulder style can then fix one's speed (successively) in three axes at a location distant from nearby gravity gradients to which the device is also sensitive?
(It was recent news that a fast walk for translation and standing from the seated position for elevation, are detectable by this clock.)

Brian W

On 10/1/2010 12:58 PM, Spagna Jr., George wrote:
Brian Whatcott comments:

I should be grateful for some commentary on the proposition that you CAN
determine absolute axis of rotation by experimental means.
My initial reaction is that rotation is not inertial, so you can do experiments to characterize it without violating provisions of SR. If I'm oversimplifying, perhaps I don't understand your question.

Dr. George Spagna