Welcome to the NavList Message Boards.


A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding

Compose Your Message

Add Images & Files
    Re: Calculating accurate apparent-angles between stars
    From: Fred Hebard
    Date: 2003 Jan 6, 22:36 -0500

    My understanding is that the method you presented at the head of this
    thread computes an expected observed interstellar distance given a
    known position and time.  This is somewhat the inverse of computing a
    time from an observed interstellar distance.  My understanding is
    that Borda's, Young's and Bruce Stark's methods address the latter
    question.  In referring to those procedures, I was merely expanding
    upon your statement that "Unfortunately, doing the reverse
    calculation, to discover the time and the longitude from a lunar
    distance, is somewhat more difficult," and implying that they are not
    appropriate to the "apparent-angle between stars" problem.
    I must reiterate that I am a complete neophyte in these matters and
    must perforce bow to your thorough knowledge and experience.  I was
    merely comparing the numerical result from Young's method to that of
    Stark, and the inputs.  I was assuming since both methods addressed
    the problem of clearing an observed lunar distance of the effects of
    refraction, parallax, semidiameter, augmentation, etc, they would be
    methods for solving similar spherical triangles.  I know not whether
    this assumption is correct.  The purpose of the comparison was to
    extend my understanding of the procedures.
    Frederick V. Hebard, PhD                      Email: mailto:Fred@acf.org
    Staff Pathologist, Meadowview Research Farms  Web: http://www.acf.org
    American Chestnut Foundation                  Phone: (276) 944-4631
    14005 Glenbrook Ave.                          Fax: (276) 944-0934
    Meadowview, VA 24361

    Browse Files

    Drop Files


    What is NavList?

    Join NavList

    (please, no nicknames or handles)
    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 Settings

    Posting Code:

    Custom Index

    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