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    Re: History of the IDL
    From: Wm Pettyplace
    Date: 2000 Jan 14, 12:22 PM

    Robert H. van Gent,
    Here is a WEB site with some history and information on the IDL,
    along with a lot on navigation when you return back
    page:  http://aa.usno.navy.mil/AA/AAmap.html
    Maybe it will help you.
    Bill Pettyplace
    At 01:23 AM 1/8/00 +0100, you wrote:
    >Dear list members,
    >A (belated) Happy New Year and fair sailing to all.
    >During the past year I have been collecting information for a paper on
    >the history of the International Date Line (IDL) but I have discovered
    >that reliable literature on this topic is very scarce. Everyone of
    >course knows what the IDL is and where it is located ("look it up in
    >your atlas") but its precise course over the waters of the Pacific has
    >varied much during the past few centuries (even without taking the 1995
    >adjustment of Kiribati into account). Having traced the course of the
    >IDL on a number of authoritative 20th-century atlases, I ended up with
    >as many different delineations.
    >Apparently, most 20th-century cartographers have traced the course of
    >the IDL following that in the publications of the hydrographical
    >departments of the British and American Navy. One publication in
    >particular appears to be the most authoritative, the so-called "Pacific
    >Islands Pilot" which has been regularly issued by both departments.
    >Unfortunately, this publication is not easy to obtain from Dutch library
    >collections and I hope that by addressing this list I may be able to
    >gather more information - probably some of you on the list own a copy of
    >the "Pacific Islands Pilot" or have easy access to one.
    >I have put up a small web page with a questionnaire that I hope to be
    >able to fill in with your help. It is located at:
    >   http://www.fys.ruu.nl/~vgent/idl/idl.htm
    >I would be most grateful if anyone on this list who owns or who has easy
    >access to any edition of the "Pacific Islands Pilot" can communicate to
    >me the therein listed co-ordinates of the great circle segments
    >delineating the IDL. This would greatly help me in reconstructing a
    >history of the IDL.
    >Any suggestions for literature on the history of the IDL will also be
    >Best wishes,
    >* Robert H. van Gent * Tel/Fax:  00-31-30-2720269              *
    >* Zaagmolenkade 50   * E-mail:   r.h.vangent@astro.uu.nl       *
    >* 3515 AE Utrecht    * Home page (under construction):         *
    >* The Netherlands    *         http://www.fys.ruu.nl/~vgent/ *
    Bill Pettyplace                       NWS, Aviation Weather Center
    816-584-7252 Office voice             7220 NW 101st Terrace, Rm 101
    816-880-0650 Office FAX               Kansas City, MO  64153-2371
    888-934-1241 Pager (Numeric only)
    William.Pettyplace@noaa.gov    -or-   wpettyplace@awc.kc.noaa.gov

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