On Sunday, January 20, 2019 at 9:23:09 AM UTC-6, John Clark wrote:
>
> On Saturday, January 19, 2019 at 5:22:25 PM UTC-6, Philip Thrift wrote:
>
> > *T*
>>
>>
>> *his by Carlo Rovelli:> https://arxiv.org/abs/1802.02382 
>> <https://arxiv.org/abs/1802.02382>> concludes:> "Notice that nowhere in the 
>> basic equations of the theory a time coordinate t or a space coordinate x 
>> show up**"*.
>
>
> Experiments involve space and time, if those equations involve neither I 
> don't see how you could ever test them to see if they're correct;  and if 
> you can't do that then it's not science, it's just philosophy. And 
> philosophers have been proven wrong far more often than proven right.
>
>  John K Clark
>
>
 

What we call space *(x,y,z)* is just what we measure with a ruler.
What we call time* t* is just what we measure with a clock.

A space measurement = a ruler measurement.
A time measurement = a clock measurement.

That's all we know about space and time.

- pt

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