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From: Martin Brown <'''newspam'''@nonad.co.uk>
Newsgroups: sci.electronics.design
Subject: Re: A single earth moon time system
Date: Wed, 14 Aug 2024 10:56:48 +0100
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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


-- 
Martin Brown