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
    Your paper in JoN.
    From: George Huxtable
    Date: 2008 Apr 7, 17:25 +0100

    Dear Andres,
    
    Pleased to see your paper in Jounal of Navigation.
    
    Coming from an earlier generation, I didn't really take in vector
    mathematics as applied to such problems. So much of your paper went over my
    head.
    
    What I want to ask about are your words in 2.3 about correcting for the
    motion of an observer.
    
    An observer who has measured the altitude of a star to be, say 30 deg, knows
    that his locus is on a circle radius 60 deg centred at the GP of the star,
    (say, at dec = 0, GHA = 0, as in the example in paragraph 4 of my paper in
    JoN, 59, No3, pages 521-524, which I think you have). And then the  observer
    moves a known distance, say 60 miles North. His new locus is a closed
    figure, somewhat egg-shaped, but NOT a circle any longer. Does your
    algorithm in A2 find the crossings of that non-circle with another circle
    centred on another star (say, at dec = 1deg N, GHA = 45 deg W, seen at 45
    deg alt, as in that example).? What result does it give?
    
    Yours, George.
    
    contact George Huxtable at george@huxtable.u-net.com
    or at +44 1865 820222 (from UK, 01865 820222)
    or at 1 Sandy Lane, Southmoor, Abingdon, Oxon OX13 5HX, UK.
    
    
    
    
    
    
    --~--~---------~--~----~------------~-------~--~----~
    Navigation List archive: www.fer3.com/arc
    To post, email NavList@fer3.com
    To , email NavList-@fer3.com
    -~----------~----~----~----~------~----~------~--~---
    
    

       
    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