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
    Name or NavList Code:
    Email:
       
    Reply
    Re: Results of the sunclock experiment
    From: David Pike
    Date: 2021 Jun 5, 00:56 -0700

    Here are a few more of my thoughts so far.  1. I wish I had a couple of prisms to play with; we don’t even have a chandelier to rob.  2.  The rate of movement of the red and cyan bands/fringes (not sure which they are yet) in Geoffrey’s video is about the same as the movement of the Sun across narrow slot – 32’arc in 128 seconds of time.  3.  Diagrams of a prism producing spectrums usually start off with a point source of light, but the raw Sun is not a point source of light.  Therefore, when a prism is held in raw sunlight the spectrum appears to be predominantly red to white to cyan, just like the colours in Geoffrey’s video (see youtube video: 'prisms, light, and color' from around 57 seconds in).  4.  Two triangular prisms placed point to point would produce two red-white-cyan spectrums with the reds closest and the cyans furthest apart, so it might be possible to arrange them to move in a colour cancelling manner.  My brain runs out of RAM at this stage. These thoughts don’t solve the problem, but they keep me thinking about colour splitting and merging devices.  DaveP

       
    Reply
    Browse Files

    Drop Files

    NavList

    What is NavList?

    Get a NavList ID Code

    Name:
    (please, no nicknames or handles)
    Email:
    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:

    Email Settings

    NavList ID 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