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**Physics, Astronomy & Cosmology / Re: Is time dilation rigorously predicted from first principles?**

« **on:**02/01/2019 05:39:44 »

It was predicted first, but since has been experimentally verified. In fact, we rely on it every day: gps calculations rely on time dilation calculations to be correct. The satellites that send the GPS signals are moving so fast -- and are so high up -- that time dilation from both special and general relativity needs to be taken into account so your phone can tell you where you are.