[time-nuts] Re: LTC

[Bob Camp]

Hi


> On Apr 13, 2024, at 8:28 AM, Tom Van Baak via time-nuts <time-nuts at lists.febo.com> wrote:
> 
> > What do people on Earth do if they live in someplace like Denver that isn't at sea level.
> 
> Hal,
> 
> Everyone uses UTC, which is already corrected for relativistic effects. That's why clocks in Denver and New Orleans and everywhere else agree. UTC is not just free running cesium clocks, it's cesium clocks referenced to "the rotating geoid", meaning elevation, rotation, even oblation, are taken into account. Otherwise it would be chaos as everyone with a good clock would disagree on what time it is.
> 
> Back to the lunar thread, here's a recent paper on the topic:
> 
> "A Relativistic Framework to Establish Coordinate Time on the Moon and Beyond"
> https://arxiv.org/abs/2402.11150
> https://arxiv.org/pdf/2402.11150.pdf

Well, there’s some fun math to sort through …. yikes !!!

So, we now have a first order set of math for LTC. Based on all of that, one would guess that things just might change a bit over time. (just as it does for UTC). 

Do we get lunar leap seconds? 

Yes, it’s really a two part question. First part would be “do we need lunar leap seconds?”. If the answer turns out to be no, then everything stops at that point. Second part would be, even if they are “needed”, based on how much fun they are here on earth, do we force the moon to have them as well? We’re kinda sorta starting from scratch here.

Bob

> 
> /tvb
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