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Old May 14th 18, 11:16 AM posted to sci.space.station
Jeff Findley[_6_]
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Default Time Dilation on the International Space Station

In article ,
says...

https://en.wikipedia.org/wiki/File:D..._dilation.pngT

Why don't you measure time dilation on the ISS ?
Physicists are claiming that clocks on the ISS would lose 24.6 us/day,
whereas clocks on the GPS are claimed to gain 37 us/day. Since the
clocks are in free fall in both cases this seems highly unlikely to me.


Time dilation happens due to the difference in velocity between two
points. It absolutely happens. GPS takes that into account due to the
precise timings required (i.e. since it's used on earth, the time
reference is adjusted such that receivers on the earth get the correct
time).

I'm not sure how ISS sets its clocks, but the computers are all
networked together, so no doubt they're using the same time reference.
In practice this isn't really a big deal since the difference in
velocity isn't that great.

However the physicists claim that,due to the higher velocity and lower
altitude of the ISS, the direction of the time dilation would reverse.
If it is really true this would indeed be a spectacular demonstration
of the correctness of Einstein's Special and General Relativity, but
I don't believe it myself.


It's complex stuff. You have to take into account both general
relativity and special relativity.

https://en.wikipedia.org/wiki/Time_dilation

Jeff
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