Time Dilation by Latitude

Time Dilation by Latitude refers to Albert Einstein's prediction that time would tick slower at the equator than at the poles.

From The Fascinating Life and Theory of Albert Einstein:

Precision clocks were not yet advanced enough to measure the effect at the time, but since the invention and and advancement of atomic clocks there have been efforts to use new technologies to measure and demonstrate this effect.

University of Maryland
https://umdgrb.umd.edu/~goodman/review/ThemeGroup2_Exp.ppt

In 2005 the University of Maryland found that there was no difference in clock time with Atomic Clocks:



The University of Adelaide
The equivalence principle as a stepping stone from special to general relativity: A Socratic dialog S. P. Drake School of Chemistry and Physics

Full Text Link

Professor Drake at the University of Adelaide explains that there is no time dilation between different latitudes. Professor Drake further provides an explanation for the lack of time dilation. The paper is written in the form of Socratic dialog.

Explanation
In order to explain the lack of this effect on a rotating earth, the Professor Drake proceeds to explain that clocks tick the same rate by virtue of Einstein's Equivalence Principle:

Addendum
The above author uses the Equivalence Principle to explain why clocks all tick at the same rate across the surface of the Earth. The Equivalence Principle says that gravity operates as if the earth were accelerating upwards. We may only agree with this argument.

https://slideplayer.com/slide/8138482/



Apparently, this effect not only applies to gravity, but to time as well. Time dilates in agreement with an upwardly accelerating earth, but in disagreement with a rotating one.