Welcome to the NavList Message Boards.

NavList:

A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding

Compose Your Message

Message:αβγ
Message:abc
Add Images & Files
    or...
       
    Reply
    Re: The leap second is dead
    From: Frank Reed
    Date: 2022 Nov 26, 10:29 -0800

    Bob Goethe, you wrote:
    "One can choose the time server used by his cellphone."

    That may be something local to your service. There's no option on my phone to select a time server for the phone itself (though some specialty apps, of course, provide such options). Instead my phone, and all other US phones that I have examined, get their time from the service provider's network (from the "cell towers") or by manual entry. Anyone else? Other countries?? Can you manually enter a time server in your phone's settings?

    You added:
    "I use a time server that gives UT1 times."

    Which one? I didn't know there were actual time server's broadcasting UT1 (makes sense, just news to me!). Since the difference, DUT, between UT1 and UTC is just a fraction of a second, there's another issue here. How often does your phone check in to get an update from the server, and how much does the phone's internal clock drift between updates? In short, how close is to UT1 after, let's say, six hours? Or twelve hours?

    You concluded:
    "As far as I'm concerned, they could just continue indefinitely publishing the Nautical Almanac with UT1 times."

    Yes, I agree. That's the simple solution and the best solution. And bear in mind that "the" Nautical Almanac is a rapidly disappearing concept. People still but "official" Nautical Almanacs for reasons both rational and ir-. But we can now safely get our navigation data from numerous other sources which are almost all derived from the same sources (JPL etc) as the official almanacs. It may well happen that most "app" almanacs will allow an option to use either UTC or UT1. Let's just hope they make it blatantly obvious which one is in use!

    Frank Reed

       
    Reply
    Browse Files

    Drop Files

    NavList

    What is NavList?

    Join NavList

    Name:
    (please, no nicknames or handles)
    Email:
    Do you want to receive all group messages by email?
    Yes No

    You can also join by posting. Your first on-topic post automatically makes you a member.

    Posting Code

    Enter the email address associated with your NavList messages. Your posting code will be emailed to you immediately.
    Email:

    Email Settings

    Posting Code:

    Custom Index

    Subject:
    Author:
    Start date: (yyyymm dd)
    End date: (yyyymm dd)

    Visit this site
    Visit this site
    Visit this site
    Visit this site
    Visit this site
    Visit this site