Proven again: time ticks faster away from Earth, slower on it

ack

VIP/Donor & WBF Founding Member
May 6, 2010
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#1
As Einstein explained, gravity arises because massive bodies warp space-time. Free-falling objects follow the straightest possible paths in that curved space-time, which to us appear as the parabolic arc of a thrown ball or the circular or elliptical orbit of a satellite. As part of that warping, time should tick more slowly near a massive body than it does farther away. That bizarre effect was first confirmed to low precision in 1959 in an experiment on Earth and in 1976 by Gravity Probe A, a 2-hour rocket-born experiment that compared the ticking of an atomic clock on the rocket with another on the ground.


In 2014, scientists got another chance to test the effect when two of the 26 satellites now in Europe’s Galileo global navigation system, like the one pictured above, were accidentally launched into elliptical orbits instead of circular ones. The satellites now rise and fall by 8500 kilometers on every 13-hour orbit, which should cause their ticking to speed up and slow down by about one part in 10 billion over the course of each orbit. Now, two teams of physicists have tracked the variations and have shown, to five times better precision than before, that they match the predictions of general relativity, they report 4 December in Physical Review Letters. That’s not bad, considering the satellites weren’t designed to do the experiment. However, another experiment set to be launched to the space station in 2020 aims to search for similar deviations with five times greater precision still.
https://www.sciencemag.org/news/201...ic-clocks-confirm-einsteins-theory-relativity
 

ack

VIP/Donor & WBF Founding Member
May 6, 2010
5,584
218
63
Boston, MA
#3
See also https://foxnomad.com/2017/08/15/travel-plane-time-slows-heres-calculate-much/

The first thing to know is that whenever you move through space, by walking, running, driving, etc. relative to people who aren’t in motion, you are traveling just a bit slower through time. This effect has been confirmed by atomic clocks placed in airplanes as well as orbiting satellites and compared to those on the ground.​

Additionally, according to Einstein’s General Theory of Relativity, time moves faster in the absence of a gravitational field. (Relative to others who are in stronger gravitational fields; in other words, closer to ground, for example.) The higher up you are, the further you are from Earth’s mass, which means slightly less gravity for you and a slightly faster clock. While standing, even your head is ever so slightly moving a bit faster through time, since it’s a meter or two higher above the ground than your feet.​
 

steve williams

Site Founder, Site Owner, Administrator
#4
fascinating stuff ack. Maybe we should wear our watches around our necks rather than around our wrists
 

ack

VIP/Donor & WBF Founding Member
May 6, 2010
5,584
218
63
Boston, MA
#5
LOL. Imagine what happens to time tracking when our head spins! It distorts gravity, therefore, time.
 

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