On 5 January 2014 16:03, meekerdb <meeke...@verizon.net> 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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