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    A C Gregory Lunar Distance
    From: Kieran Kelly
    Date: 2003 Jul 28, 22:09 +1000

    I have recently completed a study of a lunar distance observation completed
    by the Australian explorer Augustus Charles Gregory in 1856. This paper was
    completed as a guide to the explorer's detailed records filed in the
    Mitchell Library in Sydney.
    Although it is 60 pages long I thought some members of the list may be
    interested in reading it as it is a practical demonstration  of how lunar
    distance observations were undertaken in the field and the shortcuts and
    techniques  used by professional surveyors and explorers to work out their
    longitude. All Gregory's lunar observations  were reduced to longitude in
    the field , unlike those of his predecessors in the United States, Lewis and
    To visit the site the following URL should be used. Note that the entire
    address has to be typed including the spaces.
    http://users.bigpond.net.au/kjkelly/gregorylunar/A Lunar Distance
    Calculation v1.pdf
    Because of the length of the document and its size, it may not be
    practicable for some members to access.
    Gregory was Australia's most outstanding terrestrial explorer, on a par with
    James Cook, Matthew Flinders and Phillip Parker King. While Cook, Flinders
    and King delineated the exterior coastline of this country, so Gregory
    delivered us the interior. He invented the modern Australian horse
    packsaddle, a revolutionary compass known as the Gregory pattern compass,
    was a competent horologer able to strip and repair chronometers in the bush,
    worked out advanced methods of preserving food for long distance  packhorse
    trips and was free of scurvy throughout  his entire exploring career. During
    this career he did not lose one man and never shot an aborigine.
    I commend his work to you with the suggestion that exploration  at this
    level was really a work of art.
    I welcome any feed back on this document either via the list or by email on
    The author acknowledges the contribution of list members George Bennett
    (Australia) George Huxtable (England) Bruce Stark (USA) for their assistance
    in the preparation of the material.
    Kieran Kelly

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