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: No DR position. How can you get an accurate celestial fix?
    From: David Iwancio
    Date: 2020 Jan 22, 01:02 -0800

    Something to keep in mind about iteration is that "lines" of position generally cross each other twice.  If you're working with only two lines, you actually have two equally valid fixes.  An iterative process will typically converge on the one that's closest to your initial guess.  (It can be fun to deliberatley "guess" your antipode and see where the process puts you.)

    Absolutely any information you have on the azimuths of the two bodies is usually enough to work as a sanity check here.  For example, if your sun-moon fix has the sun on the right and you distinctly remember it being on the left, you've arrived at the wrong fix.

       
    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