Would there be a change in time in terms of the length of time it take for a lunar eclipse to cross the moon as seen from earth compared to as what would be experienced from the moons surface?

  • $\begingroup$ You have a similar question Lunar Eclipse and relativity can you add a short explanation how this one is different, and in what ways the answer there applies here? Thanks! $\endgroup$
    – uhoh
    Aug 17 at 0:38

Strictly speaking, yes: For objects close to a large gravitational potential (the Earth), time moves faster than for objects far from it, or close to a smaller gravitational potential (the Moon). For example, Canadian astronaut Chris Hadfield mentioned, in a recent interview, being younger than he would be if he had stayed on the Earth—by about 0.006 seconds, mind you…

So yeah, the difference would be minimal, but “Moonlings” would experience a different duration for the eclipse than Earthlings.

  • 1
    $\begingroup$ A clock on Earth's surface loses about 2.19 seconds per century due to the Earth's gravity. See en.wikipedia.org/wiki/Gravitational_time_dilation There's a graph showing the combined effects of gravity & orbital speed in the "Experimental confirmation" section. $\endgroup$
    – PM 2Ring
    Jul 5 at 7:01
  • $\begingroup$ So is there any way of finding data that would confirm this theory? $\endgroup$ Jul 7 at 6:19
  • $\begingroup$ It’s not about the Moon, but it can be extrapolated to it: GPS satellites were launched without correction for time stretching due to the General Theory of Relativity. A correction had to be activated after a short time, as their time wasn’t the same as ground time. $\endgroup$ Jul 7 at 23:38
  • $\begingroup$ Do you know where I can find this data $\endgroup$ Jul 8 at 4:27
  • $\begingroup$ sci-hub.se/10.1063/1.1485583 and en.wikipedia.org/wiki/… $\endgroup$ Jul 8 at 5:09

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.