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: Proportional logs, etc.
    From: Bruce Stark
    Date: 2004 Aug 26, 19:39 EDT
    Henry,

    As for how to calculate proportioning logs:

    They are for a three hour interval, and designed to proportion to the nearest second of time. Three hours contains 10800 seconds.

    One hour contains 3600 seconds. So the PL of one hour is simply the log of 10800/360.

    The PL of seven seconds is the log of 10800/7.

    The PL of one minute, six seconds is the log of10800/66.

    And so on.

    Since there are 10800 seconds of arc in three degrees, PL tables can be used to proportion small angles as well.

    Hope this helps.

    Bruce
       
    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)