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: Brown-Nassau slide rule for clearing lunars
    From: Francis Upchurch
    Date: 2015 Oct 28, 01:48 -0700

    Thanks Frank,

    yes I fully understand the accuracy issues with lunars and made that point in my post, perhaps not very clearly. I am just interested in the BN and possible uses. I think a very big one may be accurate to say 1' ? we'll see.

    I generally get good results with the Fuller slide rule (usually same as calculator). Also, the hv-Doniol seems to work aswell. (see other post, which is stuck somewhere)

    I've tended to use the Karl formulae because I find them easier to understand than your series method, for a "visual" person like me with no natural feel for maths, the simple nav triangle pictures showing the vertical movements of the sun and moon alts (mostly with lunar parallax) can be seen directly in the formulae.

    i will however, take you sage advice and try the Fuller with the series method.

    Most of my lunars in the past, cleared with the Fuller by Karl formulae seem to be ok when checked against your web site calculator, which I always use as a final arbiter! 

    Many thanks again.

    Francis

       
    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