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: Results of the sunclock experiment
    From: David Pike
    Date: 2021 Jun 6, 01:41 -0700

    Geoffrey Kolbe you wrote: Well Dave, if you had a roof-top prism to play with, what interesting property does that have....?

    Ah yes Geoffrey.  Varieties of prisms are as bit above my head, but aspects of your website suggest you might have retained familiarity with them for use in spotting sights.  However, I’ve just realised that initial setting up to due south needn’t be the problem I imagined.  You just need your accurate longitude, an almanac, a radio clock with a seconds read out, and an assistant to count down the time.  Work out Mer Pass time to one second and set the equipment up on south as best you can. Then as Mer Pass approaches, keep nudging the equipment until at the moment of Mer Pass give one final nudge, if required, to leave only the white line on the screen or eyepiece.  Then tiptoe away very softly. DaveP

       
    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