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: Spherographical Navigation and Professor Keator
    From: Francis Upchurch
    Date: 2015 Feb 24, 11:39 -0800

    Thanks Hanno,

    Whow! Looks too difficult even for me! I think Bygrave/Fuller/ BN much easier for amateur builders and probably get better results. However, a good engineer should be able to do this. ? There is a challenge Hanno. If I build the definitive Bygrave (already done) and BN (soon , I hope), maybe an engineer (like you ?) should be able to build this? Looks good but very difficult. The BN is always going to be easier to build  and probably more accurate than this. It is not exactly a direct plot, but very close and straight onto a flat surface as apposed to a spherical curve. Job done. I guess the constant altitude curves and dec curves use the maths, but the end result is a simple analogue, flat surface system that gives you the answer quickly and easily. Just as easy as a direct plot of circle of equal altitudes I think? Also, you get everything with just 2 quadrants. Still waiting to hear from you maths guys whether we could do an "orange globe direct plot" using just a quadrant or 2? (ie not whole globe) Cant as yet get my brain around that one.

    Have a good trip.Nz will probably give you much hope for the future. Generally does.


    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