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    Re: The mil as a unit of angle.
    From: Myrt Webb
    Date: 2003 Mar 11, 19:49 -0700

    The mil is 1/6400th of a circle and 1 mil subtends an arc of 1 meter at 1000
    It is used in gunnery for both adjusting fire and laying the guns for
    direction and elevation.
    Myrt Webb
    -----Original Message-----
    From: Navigation Mailing List
    [mailto:NAVIGATION-L@LISTSERV.WEBKAHUNA.COM]On Behalf Of George Huxtable
    Sent: Tuesday, March 11, 2003 5:38 PM
    Subject: The mil as a unit of angle.
    Dour Royer said-
    The use of a mil-compass is also needed.Mil does not
    >> stand for military but mil:1,000th of something.The mil-compass is hand
    >> held and has 6,400 seperate & equal segments in 360*.The compasses are
    >> also known as lensatic compasses.You can get great accurecy in
    >> distance,height and position useing the mil.
    Response from George-
    It's good that we keep on learning new things on this list. I had never
    heard of the mil as a unit of angle, nor had I come across insertion and
    resection in Doug's context.
    However, it's rather mind-boggling to discover yet another unit of angle,
    64,000 in one rotation! Presumably, this is to put compass "points" at
    round-numbers of units. However, this convention shares many of the
    awkwardnesses of our 360 degree system. It makes the heart sink, when
    there's an obvious logical measure of angle just waiting to be adopted, the
    Turn, to be subdivided into 1,000 milliTurns. When you go through one Turn
    you get exactly back to where you started, so calculations involving angles
    exceeding 1 Turn just require dropping the integer part. It's decimal all
    the way, none of these nasty sexagesimals. Of course, it shares with all
    other decimal units the disadvantage of not dividing easily into 8ths and
    16ths and so on, as were used for compass "points". But we don't use
    compass points much these days, courses and bearings are nowadays
    understood simply as a number.
    Of course, there are serious snags about making such a change. It would
    require recalibration of all our charts, compasses, and sextants. Not for
    the faint-hearted!
    George Huxtable.
    contact George Huxtable by email at george@huxtable.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.

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