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: Leap second on December 31
    From: UNK
    Date: 2016 Dec 30, 08:26 -0800

    As I see it, the conflict arises between two different "customers" for time.

    Customer one wants to know what time it is with respect to the celestial sphere, most importantly the sun. Keeping the sun's meridian passage near 12:00:00 at the reference meridian requires leap seconds; keeping the equinoxes in place requires leap years. UT1 and UTC work for this customer.

    Customer two wants to know how many seconds (and perhaps fractions thereof) have elapsed between two events; or conversely, to be able to unambiguously timestamp events and to sequence them. Leap thingies are antithetical to this. TAI and Julian Day Number work for this customer.

    -- Peter

    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