What sort of nanosecond resolution do you need for a signal that travels up and down by a mile, for example?

What sort of nanosecond resolution do you need for a signal that travels up and down by a mile, for example?

I am looking for a claimed accuracy of about +/- 5 nanoseconds. I could probably settle for one that claims +/- 10 nanoseconds but not less. I would first test on the level "shooting" north-south to get a null result. Then I would shoot east-west and would hope to see some small difference in light speed based upon the rotation of the Earth. Finally I would shoot from a mile high altitude with two fiber optic cables stretched downward for about 1 mile. If I would get a statistically significant positive result I would shoot the same set-up many times as well as exchanging timers and the set-up. I would continue for maybe several days/ weeks to get an average. After being satisfied with a positive result I would find another location to repeat the experiment. If I would continue to get a positive result as I expect, I would look for the best university affiliation that I could find to initially confirm and then endorse the results. After that I would publish probably with a post-grad co-author.

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Edited November 4, 201114 yr by pantheory

Hm. Would you need a timer at each end, or would an effect be visible if you bounced the signal back and detected it at the same place it was emitted from?

Hm. Would you need a timer at each end, or would an effect be visible if you bounced the signal back and detected it at the same place it was emitted from?

Yes, I would need a timer at each end to measure the time for a one way trip, first one way then the other -- going back and forth many times. A reflector would give me the average speed of light which would be nothing new

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Edited November 4, 201114 yr by pantheory