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
    Name or NavList Code:
    Re: Agnostic gnomon and horary error
    From: Geoff Hitchcox
    Date: 2024 Jun 10, 17:23 -0700

    Chuck Varney, thank you for your explanation, my words were clumsy and I think I made the same mistake as Edwin Pugsley (the designer and builder of the Sundial) and used the wrong angle in the triangle to get the angle of the Gnomon relative to the horizontal.

    I wonder how many people have looked at the shadow on the Armillary Sundial, applied the equation of time and Daylight saving and then concluded that *they* must have miscalculated - because they can't equal "watch time" (apart from Solar Noon).

    I wonder if Edwin Pugsley was ever told that his Sundial gave the wrong time!

    I'm sure if Edwin Pugsley had seen your drawing Chuck - he would have made a sundial that gave the right solar time.

    Frank_R was correct (as always ;-) in his initial observation of the Gnomon - well Gdone.

    Regards, Geoff Hitchcox, Christchurch, New Zealand.

    Browse Files

    Drop Files


    What is NavList?

    Get a NavList ID Code

    (please, no nicknames or handles)
    Do you want to receive all group messages by email?
    Yes No

    A NavList ID Code guarantees your identity in NavList posts and allows faster posting of messages.

    Retrieve a NavList ID Code

    Enter the email address associated with your NavList messages. Your NavList code will be emailed to you immediately.

    Email Settings

    NavList ID 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