Path: ...!feeds.phibee-telecom.net!weretis.net!feeder8.news.weretis.net!reader5.news.weretis.net!news.solani.org!.POSTED!not-for-mail
From: Jan Panteltje <alien@comet.invalid>
Newsgroups: sci.electronics.design
Subject: Re: A single earth moon time system
Date: Wed, 14 Aug 2024 10:57:26 GMT
Message-ID: <v9i2im$17gk6$1@solani.org>
References: <v9hgbs$175ds$1@solani.org> <v9hv12$ddaj$1@dont-email.me>
MIME-Version: 1.0
Content-Type: text/plain; ISO-8859-15
Content-Transfer-Encoding: 8bit
Injection-Date: Wed, 14 Aug 2024 10:57:26 -0000 (UTC)
Injection-Info: solani.org;
	logging-data="1294982"; mail-complaints-to="abuse@news.solani.org"
User-Agent: NewsFleX-1.5.7.5 (Linux-5.15.32-v7l+)
Cancel-Lock: sha1:HzncmkeBtR20X/7D4V3bkAK4IM4=
X-Newsreader-location: NewsFleX-1.5.7.5 (c) 'LIGHTSPEED' off line news reader for the Linux platform
 NewsFleX homepage: http://www.panteltje.nl/panteltje/newsflex/ and ftp download ftp://sunsite.unc.edu/pub/linux/system/news/readers/ 
X-User-ID: eJwFwQkBwDAIA0BLPIF0cgoU/xJ2F56aTWQkYmPbFXuTHVbh3kYLPj0AeKpmeh6ujLB3B/KNCI2laWe76wdNmhW1
Bytes: 3987
Lines: 61

On a sunny day (Wed, 14 Aug 2024 10:56:48 +0100) it happened Martin Brown
<'''newspam'''@nonad.co.uk> wrote in <v9hv12$ddaj$1@dont-email.me>:

>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

Oh yes
I guess that it makes things only more complicated

Time is really a very relative thing..
There was a science program on German TV last week,
they had 2  precision atomic clocks and took one with a car to a local mountain
Sure enough when it was back and they compared the 2 clocks, the mountain one
differed by several nano seconds.
So where on earth do you measure it (time) counts too.

I have a nice Rubidium 10 MHz frequency standard here:
 https://panteltje.nl/pub/rubidium_frequency_standard_running_IMG_3700.GIF

Locking stuff to it is easy:
 https://www.panteltje.nl/pub/FPGA_board_with_25MHz_VCXO_locked_to_rubidium_10MHz_reference_IMG_3724.GIF

But.. I am almost exactly at sea level, oops, but there are tides...
Tides should also have some effect (moon) on it...

I wish they dumped summer and winter time here. too many clocks to set..

Le Sage also predicts clocks runing slower in a gravity well.
Less LS particles, pendulem gets less compressed, longer... slower
Pendulum or electron orbit..
But as more particles from space than through the earth there must be a spectral widening.
because in the horizonal plane there should be a different field.
So different lengh pendulums are created.
Well, :-)
I have not measured spectral widening of my Rubidium standard yet.

Time is an interesting thing...