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 today
    From: Brad Morris
    Date: 2012 Jun 30, 13:42 -0700

    Since no one appears to have answered Frank's question, I will.

    Frank asked "is your Nautical Almanac now always wrong or always right"

    The answer depends upon how the NA is structured.  The NA is essentially a table, with the independent variable the time, and the dependent variable the celestial coordinates of the object in question.

    Since the leap second corrects the time, when we enter the NA, it provides the correct coordinates for that time.

    The NA remains as correct as it was

    On Jun 30, 2012 4:34 PM, "bill" <billyrem42@earthlink.net> wrote:
    On 6/30/2012 2:13 PM, Lu Abel wrote:
    Or folks can go to www.time.gov to watch the clock.   I've done it for a
    past leap second and the NIST clock does indeed show the sequence
    (especially the 7:59:60) Frank describes.

    I suspect my atomic clock that synchronizes to WWVB will not show the
    sequence, but simply reset itself, but Frank has be curious.   5PM for
    us West Coasters.

    I do plan to video the NIST computer clock at 8 PM EDT as well as listen to the ticks (new UTC to UT1 double clicks).

    As my RCC attempts to sync at midnight mountain time--2 AM EDT-- I imagine the NIST broadcast time and time displayed by my RCC will be out of sync (past the regular drift) for four hours. I will video the 2:00 reset as well to see if the RCC does a 02:59:60, 02:00:00 reset.

    My real concern is whether I will be sluggish and disoriented (more than usual) the day after due to the time change ;-)

    Bill B

    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