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: Formula to determine GHA of Sun?
    From: Bill B
    Date: 2014 Sep 13, 15:03 -0400

    >
    > Thank you for the method. I read Henry's comments on the Time Sight
    > method but I know nothing about it other than that. Can you direct me to
    > a clear exposition of it?
    
    Following is a historical explanation from frank Reed:
    http://fer3.com/arc/m2.aspx/Time-sight-primer-FrankReed-dec-2012-g21555
    
    Another of Franks posts:
    http://fer3.com/arc/m2.aspx/Time-sights-for-Jim-T-FrankReed-sep-2004-w17728
    
    There was also, if I recall, a post from Frank on the "reverse" time
    sight. That is, if your know your exact location you can use a
    derivative of the time sight to find the time. Can't locate it at the
    moment.
    
    Another note on the time sight:
    Don't take my ramblings as gospel. I hope I have it right, and that the
    more learned with better memories will join in and clear up my mistakes.
    
    If memory serves the angle the formula gives is not always an LHA--
    strictly speaking. It is the angle between the observers meridian and
    the body, but can be on the "wrong" side observer's meridian so may not
    strictly adhere to the definition of LHA. Some inspection/common-sense
    test and/or sketch may be needed.
    
    At the moment I'm eyeball deep in house restoration projects, and my
    main desktop work computer melted down (power supply and mother board)
    so I'm in recovery mode and don't have handy access to my files, so the
    above is the best I can do for now.
    

       
    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