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: Logarithms: adding ten
    From: Frank Reed
    Date: 2019 May 11, 13:12 -0700

    Here's a comparison of the tables that I created years ago, and continue to use, in my "Celestial Navigation in the Age of Sail" class and also the corresponding table from the 1977 edition of the goverment-issue American Practical Navigator tables. Naturally, the latter was (and is) a relatively conservative publication so it's no suprise that these "old fashioned" tables with "ten added" were still in print as late as that. For my class, of course, we're duplicating methodologies from earlier decades. Notice that I head the columns with the arguments for the time sight problem rather than the name of the trig function (we don't need tan/cotan but the others are all there). That's easier in every sense for the specifics of the class.

    Frank Reed

    File:

      
    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