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: 0000 not 2400?
    From: Charles Seitz
    Date: 2004 Oct 18, 15:02 -0400

    George,
    
    I'll widen things even a bit further.  Why do we
    have East and West longitude?  Longitude should start
    a 0.0 and proceed up to 359.999999999.. degrees just
    as GHA does.
    
    There is too much culturally induced confusion.  I guess
    that makes life more interesting.
    
                                          ---  CHAS
    
    
    
    George Huxtable wrote:
    > Jim Thompson wrote-
    >
    >
    >>Although we can think and write the term "2400", it has no practical
    >>meaning, is that right?  As soon as the time advances past 23:59:59, then
    >
    >>from a navigator's perspective the date changes to the next day, at time
    >
    >>00:00:00.
    >
    >
    > To widen the argument somewhat, even more absurd is our common convention
    > of referring to times, in the hour after noon. as 12:xx pm, and the hour
    > after midnight, as 12:xx am, and the dials of clocks (and even
    > chronometers) marked accordingly, when in logic they should be 00:xx, and
    > zero-hour should be marked as zero.
    >
    > Time has a history that goes a long way back, as is clear by the famiiarity
    > we have with clocks marked in Roman numbers. Without a symbol for zero, or
    > the idea that you could count and measure things starting at zero rather
    > than starting at one, how would you mark midday, logically, in Roman
    > numerals? Can't be done! So we have been stuck to an illogical numbering
    > for those two hours each day, even though, for most clocks, we have since
    > changed to an Arabic numbering system in which zero presents no problem.
    >
    > To widen it further, isn't it another absudity that our date-of-the month
    > start at one, rather than zero?
    >
    > As a result, calculating the interval between two events with known dates
    > and times, becomes a real nightmare, to do longhand or to write a program
    > to do it.
    >
    > I will avoid refrain from discussing years, decades, centuries, and
    > millennia, in the interests of my blood-pressure.
    >
    > George.
    >
    > ================================================================
    > contact George Huxtable by email at george---.u-net.com, by phone at
    > 01865 820222 (from outside UK, +44 1865 820222), or by mail at 1 Sandy
    > Lane, Southmoor, Abingdon, Oxon OX13 5HX, UK.
    > ================================================================
    >
    
    
    

       
    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