Re: A single earth moon time system

On 14/08/2024 11:46 pm, Phil Hobbs wrote:

Martin Brown <'''newspam'''@nonad.co.uk> wrote:

On 14/08/2024 06:46, Jan Panteltje wrote:

Researchers figure out how to keep clocks on the Earth, Moon in sync
A single standardized Earth/Moon time would aid communications, enable lunar GPS.
https://arstechnica.com/science/2024/08/researchers-figure-out-how-to-keep-clocks-on-the-earth-moon-in-sync/
>
eeh, if they ever land on the moon again ;-)

>
I'd say as a proposal it was borderline *insane*. Why complicate time
keeping on Earth where almost everyone lives for the sake a handful of
lunar astronauts. Working in the CoM frame will work but at an enormous
price in the complexity of the equations of motion and book keeping.
>
Ephemeris or Terrestrial Dynamical Time is good enough. Anyone doing
ultra precise observation will already know how to apply all the
relevant corrections to their data.
>
The main ones being GRB's detection will be 1s different at the moon due
to light travel time. Clocks on the moon will run a bit faster due to
its much weaker gravity but just like the fix for GPS satellites you
could adjust the divisor so that it appears to tick at SI 1s rate.
>
For the number of people affected that is by far the simplest way out.
>
TDT already does well enough for all practical purposes.
>
https://webspace.science.uu.nl/~gent0113/deltat/deltat.htm
>
>

 You forget the bureaucratic advantages—the European Commission is well
along with its plans to build a suitably massive new headquarters at the
barycenter, to demonstrate that everything does in fact revolve around
them.
 The laws of physics show that this position is gravitationally unstable,
but Ms. van der Leyen assures that the laws of the EU take precedence, so
the plan will move forward.

Don't be silly. European politicians have gone back a bit since Angela Merkel retired - she had a Ph.D. in Physical Chemistry (as I do) but hers seems to have been more computational than mine.
Ursula Von der Leyen has a medical degree, which implies a tolerable grasp of science.
American politicians seem to have be mostly been trained as lawyers, and may have an irrational confidence in the power of the law to control reality, but European politicians are mostly more or less sane.
--
Bill Sloman, Sydney
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