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: Watches as chronometers
    From: Gary LaPook
    Date: 2013 May 31, 14:50 -0700
    Oops! I am so embarrassed because  I did not allow for the one leap second inserted during the test period on June 30, 2012. I can account for it now by either subtracting one second from the measured error or by adding one second to the calculated error and I will do it the second way.

    Trying one more time.

    Should be:
    A = 306/267/+39 fast:  B = 528/537/ -9 slow:  
    C = 886/907/-21 slow

    Averaging these differences equals 3 seconds fast.

    Using only one watch with the largest error, 39 seconds, would
    resulted in less than a 10 minute of longitude error. Using the average of
    all three watches would have produced an error of only 3/4 of one
    minute of longitude,a maximum of 4,557 feet, 1,389 meters at the equator.

    Sorry.

    gl


    gl


    --- On Fri, 5/31/13, Bill B <billyrem42@earthlink.net> wrote:

    From: Bill B <billyrem42@earthlink.net>
    Subject: [NavList] Re: Watches as chronometers
    To: garylapook@pacbell.net
    Date: Friday, May 31, 2013, 11:42 AM


    On 5/31/2013 1:11 AM, Gary LaPook wrote:
    > Using only one watch with the largest error, 40 seconds, would
    > resulted in a 10 minute of longitude error. Using the average of
    > all three watches would have produced an error of only one minute
    > of longitude, not bad for fifty-one dollars worth of watches
    > after more than three and a half years.
    
    Being it is you I am almost embarrassed to ask, but did you factor leap
    seconds into your computations?
    
    Bill B
    

    View and reply to this message: http://fer3.com/arc/m2.aspx?i=124231

       
    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