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: Moore's Error Found by Bowditch
    From: Doug Bamford
    Date: 1999 May 09, 11:26 AM

    I have lost my place here some where.
    Why is 1800 not a leap year? I always thought the method of identification
    was the year must be divisible by 4.
    1800 is in that category, is it not?
    Doug
    -----Original Message-----
    From  Gordon Talge 
    To: NAVIGATION-L{at}LISTSERV.WEBKAHUNA.COM
    
    Date: Sunday, May 09, 1999 9:57 AM
    Subject: Moore's Error Found by Bowditch
    
    
    >I finally figured it out.  Here is what I think happened.
    >
    >Declinations for the Sun are listed from 1791 to 1819. This is the
    >13th Edition dated 1798.  There are 12 Tables arranged like this:
    >
    >1) 1791, 1795, 1799, 1803 [1803 should not be listed here]
    > 3rd yr after leap yr.
    >
    >2) 1792,1796, 1800, 1804 [1800 should not be listed here]
    > leap yr.
    >
    >3) 1800
    >
    >4) 1801
    >
    >5) 1802
    >
    >6) 1803
    >
    >7) 1804,1808,1812,1816
    >   leap yrs.
    >
    >8) 1806, 1810, 1814, 1818
    >   2nd yr after leap yr.
    >
    >9) 1807, 1811, 1815, 1819
    >   3rd yr after leap yr
    >
    >10) 1797
    >    1st yr after leap yr
    >
    >12) 1798
    >    2nd yr after leap yr.
    >
    >What I think goofed them up what that the pattern of 1-2-3-leap and start
    >over again got messed up because 1800 is not a leap year.  They fixed it
    >in the tables with 1800,1801,1802,and 1803 having their own separate pages,
    >but on the labeling 1803 is also listed with table 1 and 1800 with table
    >2.
    >
    >I also noticed that 1793 and 1794 were missing. They should be with
    >1797 and 1798 respectively.  I think the reason that they are not,
    >is because the book is the 13th edition published Jan. 30, 1798. They
    >probably used the same printing setup as in past years and did not
    >want to reset the type and drop all years before 1797.  But they did
    >do it for the current years 1797 and 1798, putting them on a page
    >by themselves.
    >
    >The idea of the tables is that if you use a nautical almanac exactly
    >4 years out of date ( with exceptions ) you get the same declination.
    >
    >-- Gordon
    >
    >                                     ,,,
    >                                    (. .)
    >         +-----------------------ooO-(_)-Ooo----------------------+
    >         |  Gordon Talge WB6YKK            e-mail: gtalge{at}pe.net  |
    >         |  Department of Mathematics      QTH: Loma Linda, CA    |
    >         |  Notre Dame High School         Lat.  N  34� 03.1'     |
    >         |  Riverside, CA 92506            Long. W 117� 15.2'     |
    >         |  http://www.pe.net/ND                                  |
    >         +--------------------------------------------------------+
    >
    

       
    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