On 5 January 2014 16:03, meekerdb <[email protected]> wrote: > On 1/4/2014 6:01 PM, Jason Resch wrote: > >> 4. If block time corresponds to clock time, then how can there be a >>> single block time structure that encompasses all events when clock times >>> progress faster or slower for different observers? >>> >> This corresponds to different objects having different velocities through >> space time. > > Really just different directions through spacetime. Everything always > moves at proper speed 1 (at least classically). > > What exactly is "proper speed" in SR?
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