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: Lat/Lon by "Noon Sun" & The Noon Fix PROVE IT
    From: James N Wilson
    Date: 2009 Apr 28, 17:33 -0700
    George:
     
    I'll attach my results from your first data set. To do more, I would have to automate it, since I'm lazy. Rather than prolong this event, I fudged and used regression analysis to fit lines through your data. The scatter was beyond what my eyeballs could handle.
     
    The results are:  Lat, 56°12.2'N, Lo, 9°53.6'W.
     
    As I examine the plot, I realize that I have committed the sin of extrapolation,
    i. e., the intersection of the lines is outside of the data range. In this case, I should have used data over a longer period. That should have moved the time of LAN a bit earlier. If I use the plot from my Navigation paper, the time difference between maximum altitude and LAN is 4m50s. That moves LAN earlier by 15s, consistent with the above.
     
    I enjoyed the learning, and I got quite a bit of that.
     
    Jim Wilson

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


    ____________________________________________________________

    File:


       
    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)