Einsteinians measure the gravitational redshift (in improved versions of the Pound-Rebka experiment) and then inform the gullible world that they have measured gravitational time dilation, the miracle fabricated by Einstein in 1911:
"A new paper co-authored by U.S. Energy Secretary Steven Chu measures the gravitational redshift, illustrated by the gravity-induced slowing of a clock and sometimes referred to as gravitational time dilation (though users of that term often conflate two separate phenomena), a measurement that jibes with Einstein and that is 10,000 times more precise than its predecessor."
http://blogs.scientificamerican.com/...ted-precision/
"Einstein's relativity theory states a clock must tick faster at the top of a mountain than at its foot, due to the effects of gravity. "Our performance means that we can measure the gravitational shift when you raise the clock just two centimetres (0.78 inches) on the Earth's surface," said study co-author Jun Ye."
http://www.theguardian.com/science/2...-billion-years
The Pound-Rebka experiment unequivocally proved Newton’s variable speed of light, which means that it disproved the gravitational time dilation.