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From: Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net>
Newsgroups: sci.electronics.design
Subject: Re: A single earth moon time system
Date: Wed, 14 Aug 2024 13:46:43 -0000 (UTC)
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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. 

Cheers 

Phil Hobbs 

-- 
Dr Philip C D Hobbs  Principal Consultant  ElectroOptical Innovations LLC /
Hobbs ElectroOptics  Optics, Electro-optics, Photonics, Analog Electronics