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: Precomputed lunar distances
    From: Bill B
    Date: 2005 Apr 17, 19:04 -0500

    Fred wrote:
    
    > Refraction is critical to clearing both interstellar and lunar
    > distances.  The mistake Bauer made in the table in his book is that he
    > did not account for refraction.  That, of course, would not be possible
    > without knowing one's position.
    
    I have a second edition paperback of Bauer's "The Sextant Handbook," circa
    1995.  Appendix F deals with interstellar angles. It would appear the first
    three paragraphs have been revised, as the type is darker than the later
    paragraphs.  This is noticeable throughout the book when a few lines have
    been changed.
    
    In the revised paragraphs he does mention that refraction must be accounted
    for, bur his method is simplistic.  Take the difference between the two
    object's refraction and subtract from calculated true separation.  While it
    works for stars at the same azimuth, it falls apart in other situations.  A
    few tenths of a minute off is not, IMHO, acceptable for establishing error
    along the arc or lunars, where 0.2' off becomes 6' in latitude.
    
    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