Welcome to the NavList Message Boards.


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

Compose Your Message

Add Images & Files
    Re: Negative leap second?
    From: Sean C
    Date: 2021 Jan 5, 14:16 -0800

    This is being discussed on the LEAPSECS mailing list (of course). One user wrote:

    "The November 19, 2020 IERS Bulletin A (volume XXXIII number 047) has this line:

             UT1-UTC = -0.1728 + 0.00001 (MJD - 59180) - (UT2-UT1)                 

    Taking this prediction of UT2 literally, it suggests that the next leap second will be on June 30, 2246, and it will be negative."

    ... and even the article posted by Gary quotes a researcher at the National Physical Laboratory as saying:

    "It's quite possible that a negative leap second will be needed if the Earth's rotation rate increases further, but it's too early to say if this is likely to happen." [emphasis added]

    Browse Files

    Drop Files


    What is NavList?

    Join NavList

    (please, no nicknames or handles)
    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 Settings

    Posting Code:

    Custom Index

    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