On 12/1/2018 7:06 AM, John Clark wrote:
On Thu, Nov 29, 2018 at 6:34 PM Brent Meeker <[email protected] <mailto:[email protected]>> wrote:>> good enough for jet fighters to automatically land on aircraft carriers without a pilot, even at night in a heavy fog in a bad storm with the deck tossing up and down. /> Unfortunately for that idea, the surface of the Earth, and especially the ocean, varies by a lot more than a centimeter. /If the ocean fluctuates up and down the intensity of the Earth's gravitational field will fluctuate too and with exactly the same rhythm, the change in gravity will be very very small but a clock this good could detect it. In a practical system in wartime conditions the error would probably be a few inches rather than a centimeter but that would be good enough; even the best human fighter pilot only knows where the deck of his aircraft carrier is within a foot or two when he lands.
But an ocean wave many feet high would change the gravitational field less than would moving a centimeter relative to the Earth's center of mass.
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