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: Summer Solstice
    From: David Pike
    Date: 2016 Dec 23, 09:09 -0800

    When I was testing the DaveP patent plate glass mirror AH, salvaged from a National Service Airman’s wardrobe, I got into a dreadful knot over whether to use 1/2 , full, or twice SD and whether to add or subtract.  I worked it out in the end using drawing and managed to remember what I’d proved for at least five minutes.  I hope it didn’t involve using whatever correction made the PL come closest to my GPS position. 

    However, by that time, I’d got so goggle eyed, and the Suns were so even, that I almost lost track of which Sun was which, so I might have been shooting top to top instead of bottom to bottom without realising which and applying the SD in the wrong direction.  In the end, I found using Sun on Sun was much more practical and honest, although by that time my arm was getting tired, so it was more ‘Sun through Sun’, which seemed to work almost as well.  DavP


    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