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: Swinging the Arc
    From: Bill B
    Date: 2004 Dec 5, 18:49 -0500

    >> Bruce S wrote:
    >> "I don't think about "axis" or "rocking." All I do is move the sun back and
    >> forth on the horizon to find the best fit. "
    
    > Frank Responded:
    > I didn't think of "axis" either until I started reading some accounts of
    > this process in standard navigation textbooks. I've also watched navigation
    > students and seen them do it, as I have called it, the "wrong" way.
    
    A while back there was a discussion as to why the sextant was designed the
    way it was.
    
    It seems many have the handle at a 45d angle to the vertical and horizontal
    axis.
    
    It also seems the most desirable bodies for shooting are between 30d and 60d
    above the Earth's horizon.  Average, 45d.
    
    Is it possible the handle is placed at 45d to facilitate swinging the arc
    near the 45d average line-of-sight to the body?
    
    Bill
    
    
    

       
    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