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: Longhand Sight Reduction
    From: Greg Rudzinski
    Date: 2014 Jun 12, 11:07 -0700

    Here are 3 more Jeremy real world observations reduced by Doniol formula using cos sin havsin tables and standard 10" slide rule. Results are quite good despite the limitations of the standard slide rule. This is because the cos sum and hav LHA are biased to the left side of the slide rule number scale giving close to 4 place results.

    I've now spent a few days with the Doniol formula and feel history has underutilized it :(  Better than Ageton when using the DR as an assumed position (easier rules and more accurate). Overall almost as fast as Weem's LOP & Pub 208 short tables with the benefit of shorter intercepts. There is the potential for a very compact set of tables to complement the Nautical Almanac rather than the current NASR tables.

    Greg Rudzinski



    File:



    File:



    File:



    File:



       
    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