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: Thoughts on celestial presentations and learning.
    From: Gary LaPook
    Date: 2016 Mar 23, 08:11 +0000



    From: Mark Coady <NoReply_MarkCoady@fer3.com>
    To: garylapook---.net
    Sent: Tuesday, March 22, 2016 9:38 PM
    Subject: [NavList] Thoughts on celestial presentations and learning.

    I have recently been the beneficiary of Frank's clear style with visual aids. ..

    ..I see said the blind man.
     I loved the illustration Frank used in the 19th century class..on our sun latitude...."the way the shadow points"....a visual thing to remember.....  (same type of thing a college professer said in my twenties doing static beam analysis....you cut the beam..it falls down..the the force arrow goes this way to hold it up).

    ===============================================================

    That reminds me of the time I was flying to Europe as a passenger on an airliner and taking sun shots with my bubble sextant through my passenger window. You have to make some additional corrections to observations taken at 450 knots with a bubble sextant which depend on the relative bearing of the object. Now an official navigator on that flight would know the heading of the plane and from the computed azimuth could determine the relative bearing for doing the correction, I didn't have that information. So.. I placed a protractor with the base on the window (so aligned with the longitudinal axis of the plane) dangled by earphone next to the window above the center of the protractor and saw where the the shadow cut the scale of the protractor. Voila, the relative bearing.

    gl



       
    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