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: Long by Chron
    From: David C
    Date: 2016 Dec 7, 19:17 -0800

    A few days ago the weather cooperated and I managed to take a PM sight when the sun was on the prime vertical.

    ZT  171610

    ZD  2016/12/6

    Zone -13

    GMT 041610

    GD 2016/12/6

    ho  35° 50.1'

    GPS 41° 06.5'   175° 05.2'

    t  61 22'  by calculator

    GHA 246°  16.8'

    From which    long =  175° 05.2'  !!!!!!!!

    From Norie  A = .46      B = .46    C = 0

    so azimuth = N 90° W

    Error in long =  error  in lat * C = 0

    I recalculated t for lat +- 6' and confirmed that there was no error in long. A lat error of +-30' gave a small error in long.

    There isn't anything particularly amazing in the above except that it confirms what I learned four decades or more ago. A method used by 19th century navigators really does work!!!!!!!

    The telescopes on my sextant do not work (I am missing a tube) and usually I use a sight tube. For the above sight I used the binoculars with one objective covered with a piece of thick card. The larger images made it much easier to touch limbs.

       
    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