Two watches go against each other around the world, coming home not just the same hour

Did you know, two watches going around the world in two opposite directions, will give different results when brought to contrast?

One of the most famous experiments on Einstein's theory of relativity, perhaps the Hafele-Keating experiment , was carried out in October 1971. This experiment was run by physicist Joseph C. Hafele and astronaut Richard E. Keating performed. They carry four cesium atomic clocks flying 2 times around the world: once to the east, and once to the west. When compared to the clock at the US Naval Observatory, they found a difference in time, and this result seems to be consistent with relativity.

"In October 1971, four Cesium atomic clocks were placed on two flights around the world, a trip to the east, a trip to the west, to test Einstein's theory of relativity with the great clock. Hypothetically, when compared to the counter clock placed at the Naval Observatory, the clock going east will have a contraction time of 40 ± 23 parts per second, and the time to relax at the watch. Going westward is 275 ± 21 parts per second, the actual result, the contraction time is 59 ± 10 parts per second, while the extension time is 273 ± 7 parts per second, with the error within the acceptable range " .

The watch is used in Hafele-Kieting experiment.

In his essay on special relativity in 1905, Albert Einstein also proposed a test for the hypothesis: "We can conclude that a clock placed at the equator will be slower. , even if only a very small distance, compared to the clock placed at one of the two terminals - in similar conditions ". But at that time, Einstein's theory of relativity had not yet fully developed, so he did not realize that such experiments, when done, would produce similar results. Because of this, the Earth's surface is a gravitational equipotential , so the dynamics of the dynamics will compensate for the gravitational expansion of time.

To date, the Hafele-Keating experiment has been re-implemented with more modern and accurate means. Physicists, since 1970, have also come to the consensus that, with the dynamics of gravity, and of dynamics on time, it is completely grounded in it, rejecting criticism. This experience before.