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Originally Posted by forrest noble
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Just did the calculations again. The numbers are 64/ 982,080,000 ft per second (the speed of light). The answer is 65.2 parts per billion which is in accord with your question -- it's about 50 ppb? This quantity I agreed with in my subsequent related posting.
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Originally Posted by forrest noble
The experiment would be conducted at an angle so that the up vs. down vector could be determined. For example if the experiment were conducted at a 30 degree angle, the speed differential at that angle would be only half of the differential up vs. down. The cosecant of 30 degrees is 2. So whatever direct measurement would be measured at that angle, the results would be multiplied by two.
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So if the experiment were conducted at a 1 degree angle, the speed differential at that angle would be only ~0.017 of the differential up vs. down, which works out as ~1 ppb (part per billion).
And if the angle were ~3.6" (arcseconds, 1/1000th of a degree), the difference would be ~1 ppt (part per trillion), or 1 part in ~10^12.
Could someone please check my arithmetic?
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Originally Posted by Nereid
What is "up"?
Is it, for example, the line from the centre of the Earth through you?
Or does it have something to do with gravity? So, for example, if you are close to a dense mountain, your "up" would be different than if there were no such dense mountain (all other things being equal)?
Another 'up-depends-on-gravity' example: suppose there is a total eclipse of the Sun, directly overhead ... 'up' would be in the direction of the Sun and Moon at that time (directly overhead), but 'up' would be in away from 'differently overhead' 6 hours earlier, when the Sun and Moon would be (almost) in the direction of the horizon (i.e. horizontal)?
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This question remains unanswered; when may we expect an answer, forrest?
respectfully, Nereid