[time-nuts] Using borked Galileo sats to measure relativity

Brian Inglis Brian.Inglis at SystematicSw.ab.ca
Tue Nov 10 02:26:00 EST 2015


On 2015-11-09 22:14, Mark Sims wrote:
> http://www.theregister.co.uk/2015/11/10/borked_eu_gps_satellites_braincheck_einstein/
> Now, for 140E-6 bonus points,  spot the error in the article... 		 	   		

The Reg claims "clock 10,000 kilometers up ran 140 parts in a million of a second faster than the same device on Earth" but the original article actually states "confirming [Einstein's] prediction to within 140 parts in a million" and "will go on to test Einstein’s theory down to 2–3 parts per million."
http://www.esa.int/Our_Activities/Navigation/Galileo_satellites_set_for_year-long_Einstein_experiment

However the original article also says
"clocks...run faster in orbit than on the ground – a few tenths of a microsecond per day"
which should be about 40us/day ~ 0.4ppb for Galileo if the graph is correct in article:
https://en.wikipedia.org/wiki/Time_dilation#Time_dilation_due_to_gravitation_and_motion_together
and seems more reasonable given TVB's project GREAT results of ~ 20ns.

-- 
Take care. Thanks, Brian Inglis, Calgary, Alberta, Canada


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