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    Re: Old style lunar (in expert hands)
    From: Frank Reed CT
    Date: 2004 Dec 10, 22:06 EST
    Kieran Kelly, you wrote:
    "Also on this topic Frank  Reed wrote: "But something that might not be so
    obvious is that dead reckoning is simpler at sea since it consisted of long
    legs on constant headings. At least there aren't any currents on land!"
    I have used both horses and camels in desert conditions without landmarks
    following a compass bearing. Dead reckoning is easy under these conditions"
    Good point! DR is easier in a desert than on the open sea. Most land environments don't allow the explorer to travel on constant courses, however, making DR much messier.
    By the way, for that lunar on August 4, 1856, the predicted lunar distance you quote from the contemporary Nautical Almanac was 29..36..19. Using modern almanac data, the predicted distance at that time should have been 29..36..56. If I've followed this through correctly, that means the implied longitude is 136..11..45 which brings Gregory's lunars even closer to the correct longitude.
    Frank R
    [ ] Mystic, Connecticut
    [X] Chicago, Illinois
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