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: dip, dip short, distance off with buildings, etc.
    From: Dan Allen
    Date: 2006 Jan 5, 19:59 -0700

    On 5 Jan 2006, at 6:44 PM, Frank Reed wrote:
    
    > This  works perfectly to derive the equations in Bowditch for dip,
    > dip short,
    > Table  XV, and apparently everything else where terrestrial
    > refraction is
    > involved.  Details upon request...
    
    I too would like to see your derivation and thinking explained a bit
    more.
    
    Are you saying that this approximation is sufficient to reproduce the
    tables, or are you saying that this is exactly equivalent to the
    tables?  What about all of the layers of the atmosphere and Snell's
    law?  Can Euclidian geometry and a simple linear factor really be
    sufficient?
    
    Dan
    
    
    

       
    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