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
    Name or NavList Code:
    Email:
       
    Reply
    Re: Latitude by Polaris
    From: Andrés Ruiz
    Date: 2019 Feb 11, 08:34 +0100
    Hello Tony,

    Is it possible to solve the equation for latitude by iteration:
    Estimated position: Be, Le (DR or assumed, initial, ...)
    LHA = GHA + Le;

                    Hc = ASIN(SIN(Be) * SIN(Dec) + COS(Be) * COS(Dec) * COS(LHA));
                    dH = Ho - Hc;
                    B = Be + dH;


    For Polaris B Ho and Dec 90º
    the convergence is very fast.

    And you seem to be doing the same thing...
    -- 
    Andrés Ruiz
    Navigational Algorithms
    http://sites.google.com/site/navigationalalgorithms/
       
    Reply
    Browse Files

    Drop Files

    NavList

    What is NavList?

    Get a NavList ID Code

    Name:
    (please, no nicknames or handles)
    Email:
    Do you want to receive all group messages by email?
    Yes No

    A NavList ID Code guarantees your identity in NavList posts and allows faster posting of messages.

    Retrieve a NavList ID Code

    Enter the email address associated with your NavList messages. Your NavList code will be emailed to you immediately.
    Email:

    Email Settings

    NavList ID 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