Hi Seem we have a whole new set of time issues to deal with: (Hopefully at least one or two of these aren’t behind a paywall / blockedl for most members ….) https://www.bbc.com/news/science-environment-68722032# https://www.reuters.com/science/white-house-directs-nasa-create-time-standard-moon-2024-04-02/ https://www.theguardian.com/science/2024/apr/02/moon-nasa-coordinated-lunar-time https://www.whitehouse.gov/wp-content/uploads/2024/04/Celestial-Time-Standardization-Policy.pdf The Lunar version of UTC will be off by 58.7 microseconds per day or 6.794…x10^-10. I’m guessing it’s going to need its own version of NTP and maybe custom GPSDO’s to keep track of things. Bob

		Attila Kinali

On Thu, 4 Apr 2024 17:18:37 -0400 Bob Camp via time-nuts <time-nuts@lists.febo.com> wrote: > The Lunar version of UTC will be off by 58.7 microseconds per day or 6.794…x10^-10. I’m guessing it’s going to need its own version of NTP and maybe custom GPSDO’s to keep track of things. If I understood things correctly, the idea is to have a time distribution system designed for the moon. The whole language is kind of weird and points at creating a new time scale instead, though. But LTC shall be linked to UTC and thus run at the same rate. I guess the "off by 58.7µs" is just someone incorrectly stating the difference in relativistic shifts between a clock running on earth and on the moon. Attila Kinali -- Science is made up of so many things that appear obvious after they are explained. -- Pardot Kynes

		Attila Kinali

Hi I 100% agree that the wording of the announcement is “a bit vague”. All of the press I’ve seen goes back to one source so it’s not a lot of help. I’m guessing there will be a paper or set of papers coming out to do a better job of defining the goal. It is very unclear how they would connect to UTC. It could simply be a formula based connection rather than a full “run at the same rate” sort of thing. I would *think* you would start from TAI rather than UTC. That may be a distinction they didn’t want to get into at this point. If the goal is to link this to some sort of lunar calendar (lunar weeks, days, hours ….) then that’s even more fun to dive into. I have no clue if that’s part of this or not. Lots of things to wonder about ….. Bob > On Apr 12, 2024, at 4:39 AM, Attila Kinali via time-nuts <time-nuts@lists.febo.com> wrote: > > On Thu, 4 Apr 2024 17:18:37 -0400 > Bob Camp via time-nuts <time-nuts@lists.febo.com> wrote: > >> The Lunar version of UTC will be off by 58.7 microseconds per day or 6.794…x10^-10. I’m guessing it’s going to need its own version of NTP and maybe custom GPSDO’s to keep track of things. > > If I understood things correctly, the idea is to have a time distribution > system designed for the moon. The whole language is kind of weird and > points at creating a new time scale instead, though. But LTC shall > be linked to UTC and thus run at the same rate. I guess the "off by 58.7µs" > is just someone incorrectly stating the difference in relativistic shifts > between a clock running on earth and on the moon. > > > Attila Kinali > -- > Science is made up of so many things that appear obvious > after they are explained. -- Pardot Kynes > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe send an email to time-nuts-leave@lists.febo.com