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    Mackay on Longitude
    From: Frank Reed
    Date: 2008 Apr 09, 22:47 -0400

    Fans of longitude and lunars,
    Visit Mr. Googly's Internet Book Shoppe, and mention this secret code:
     http://books.google.com/books?id=EVdLAAAAMAAJ .
    You'll be able to acquire your very own copy of "The Theory and Practice of
    Finding the Longitude at Sea Or Land" by Andrew Mackay, the most recent
    edition, published in London in 1809. I have been told that this edition was
    printed on the occasion of Mackay's death, and it may be a re-print of the
    1807 edition.
    Mackay's Longitude is packed with mathematical detail on numerous methods
    for finding longitude focusing especially on clearing lunar distance
    observations, but also discussing longitude by chronomters, and even more
    obscure methods such as finding longitude by the magnetic variation. In
    addition, Mackay includes extensive historical background on recent
    developments in the methods of finding longitude. For example, he describes
    the history of Harrison's famous chronometers, but also places them in the
    context of the work of other clockmakers whose contributions are less
    well-known. This books is a goldmine.
    Among many fascinating theoretical contributions, I'll mention just one
    here: Mackay describes a technique for getting a complete fix of position in
    latitude and longitude from the altitudes taken as part of a lunar
    observation (see chapter VII starting on p.194). Sounds like a good idea...
    Only volume I is available. Volume II, I believe, consists of the
    accompanying tables.
    Navigation List archive: www.fer3.com/arc
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