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: Another "emergency navigation" sight reductionmethod
    From: Greg Rudzinski
    Date: 2015 Jul 16, 10:53 -0700

    Hanno,

    The Micro Ageton Log Sin Cos 10' table as you have posted looks great and works to 1' precision :) For me it is good as is. I worry that adding more to it may clutter the page.

    For some the interpolations may be tough. I do the interpolation mentally by taking the log difference then move the decimal right one to get the log value for each minute of arc. See attached RIC example for a same name reduction. The key to this table is that all "A" are Log Sin and all "B" are Log Cos for the basic Ageton format.

    Hav Doniol reduction is several minutes quicker with no special rules but it is always good to have a second CN reduction method in the tool bag as a check. 

    Greg Rudzinski

    From: Hanno Ix
    Date: 2015 Jul 16, 08:05 -0700

    Greg, Herman

     
    Greg
     
     
    before I go ahead:
     
    At 0 deg 10' the table value is 253.63 which is the biggest value on the table.
     
    I propose to normalize - meaning scale - the entire table such that this value
    becomes 1000.00.  All other values would, of course, scale proportionally by
    the same factor, namely 1000.00/253.63.
     
    This normalization would increase the table resolution by ~4 in the same space.
    It would not affect the function of the table in any other way.
     
    Should I?

    ____


    File:



       
    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