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: Navigation without Leap Seconds
    From: Geoffrey Kolbe
    Date: 2008 Apr 22, 13:10 +0100

    George Huxtable wrote:

    However, Geoffrey and I seem to disagree seriously about its earlier value,
    around 1900, which he states to be 24.349 seconds. I'm not sure where that
    comes from,

    Geoffrey Kolbe responds:

    Hello George

    As I understand it, the formula adopted by the International Astronomic Union in 1952 and used till around 1985 was:

    Delta T = 24.349 + 72.318*t + 29.950*t^2

    where t = centuries since 1900.0

    However, you are correct that the observed Delta T seems to have been about - 2.7 seconds in 1900. All of which goes to show that time can be a very confusing subject.

    Geoffrey Kolbe

    Navigation List archive: www.fer3.com/arc
    To post, email NavList@fer3.com
    To unsubscribe, email NavList-unsubscribe@fer3.com

    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