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: A sudden plot twist: from CN to cryptograhpy. :)
    From: David Fleming
    Date: 2017 Jul 19, 13:46 -0700

    Tony, 

    Not sure I followed the problem you would like to solve but I think you are overlooking some information required in your problem.

    As you say, given two points on a sphere in lat lon coordinates, you can easily calculate distance between them using Law of cosine formula.  Also using that same formula you can calculate other internal angles in the navigational triangle.

    To go from one point, a specified distance and reach another point, you must pick which great circle you want to travel along.  That is what is the Azimuth of the great circle at the given point.  Then the problem of what are the coordinates at the second point is solved using the same formulas as in the first problem.  

    It is not a one way solution if you supply enough requirements to define the problem.

    DaveF

       
    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