[Physics] Physics Digest, Vol 1, Issue 25

[Doug Marett]

Hi Tom Hollings,

    Thanks for seeing it my way! For some reason I had to view your
comments from the on line list, i am not getting  them in my gmail, not
sure why. I hope that the pictures that I have attached are coming through
okay.

regards,

Doug


On Sun, Oct 23, 2016 at 8:12 AM, Ilja Schmelzer <
ilja.schmelzer at googlemail.com> wrote:

> >  1) an individual standing on the earth would have time progressing
> faster
> > at his head than his feet (due to gravitational time dilation). How can a
> > physical object be in two time frames? When blood flows in your body,
> does
> > it move from the past to the future and vise versa? Seems logically
> > preposterous.
>
> And that's why even in standard GR all these frames play no longer any
> role.  In GR, you have systems of coordinates.
>
> And you have "proper time",  which is a bad English translation of the
> German "Eigenzeit",  sort of "private time" or so, which is simply
> clock time.
>
> Once sufficiently accurate clocks at your foot and your head show
> different results, such is life.  What do you have to object?   It is
> a claim about what some clocks measure.  It has nothing at all to do
> with logic or so.  The philosophical idea that "time is what clocks
> measure" is, of course, to be rejected as positivistic nonsense.
>
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