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: Using star-star distances
    From: George Huxtable
    Date: 2008 Sep 24, 10:37 +0100

    Frank Reed had described an observation of remarkable short-term instability
    in a plastic sextant, and I had asked for further details of the
    measurement.
    
    I though I had understood exactly what he was doing, until these words-
    
    "In any case, the sextant was lying
    | on its side and completely untouched during this test. What I was
    describing
    | was looking through a 10x scope without touching it at all. One could
    | visibly see the changes in just a few seconds. Very entertaining! "
    
    Which raises a few further questions; if Frank will help a bit further,
    about the measuring setup in use, which I am trying to picture. It seems to
    be somewhat different from the usual angle observation that's made with a
    sextant.
    
    Does the plastic sextant he was testing REALLY include a 10x telescope
    option? Or was the 10x scope added as an aid to precision? Where, in the
    optical system, did it go?
    
    If two-arc-minute changes were being observed, how were they being measured,
    if the instrument remained untouched throughout?
    
    A simple diagram would work wonders.
    
    George.
    
    contact George Huxtable, now at george@hux.me.uk
    (switched from 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 unsubscribe, email NavList-unsubscribe@fer3.com
    -~----------~----~----~----~------~----~------~--~---
    
    

       
    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