Given the Earth has a liquid core, is there any chance that turbulence in the core would move the center of gravity around by some minute amount, but large enough to throw off measurements of such tiny differences?
On Thu, Nov 29, 2018 at 9:29 AM John Clark <[email protected]> wrote: > In yesterday's issue of the journal Nature Scientists at the National > Institute of Standards and Technology (NIST) reported they have made a new > type of clock that is the most accurate ever, it's called a Ytterbium > Lattice Clock. It's about 100 times better than any previous clock, if set > at the time of the Big Bang 13.8 billion years ago today it would be off by > less than one second. > > https://www.nature.com/articles/s41586-018-0738-2 > > It's so good the main source of error is due to General Relativity, if you > lift the clock up by just one centimeter the Earth's gravitational field is > slightly weaker and so the clock runs noticeably faster, that may be why > NIST is now working on a portable version of their Ytterbium Lattice Clock. > If GPS satellites had clocks this good they'd know where they were relative > to the Earth to within a centimeter and so could tell users on the ground > where they were within a centimeter; and that would be more than 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. It would be by far the best instrument ever made to detect > tiny changes in the gravitational field, and that would make it much easier > to find things buried deep underground. The Earth just became more > transparent. It might even be used to detect Gravitational Waves and Dark > Matter. > > John K Clark > > -- > You received this message because you are subscribed to the Google Groups > "Everything List" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To post to this group, send email to [email protected]. > Visit this group at https://groups.google.com/group/everything-list. > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "Everything List" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/d/optout.
