On 1/6/2014 7:03 AM, Edgar L. Owen wrote:

What clock measures your coordinate time? Apparently none. It's beginning to sound just like another name for Present time.

What's the difference?

The difference is that you imagine that Present time is a unique global coordinate time (just like Newton), but coordinate time is just a convenient labeling of events and even when you restrict coordinate time to be global across an inertial frame it is not unique, it depends on the motion of the frame - that's why it's called "relativity", it's "relative" to the motion.


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