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    Navigation on whaleships
    From: Frank Reed
    Date: 2009 Jan 30, 19:35 -0800

    I posted this a long time ago. Time for a re-run.
    I'm attaching a distillation of the logbook of the maiden voyage of the 
    whaleship Charles W. Morgan. Many of you have been aboard this vessel, the 
    last remaining whaleship of the great 19th century American whaling fleets; 
    it is the center-piece of the collection at Mystic Seaport. Each dot shows 
    the recorded latitude and longitude of the Morgan. Most of the longitudes 
    were longitude by chronometer, sometimes by account. The yellow/green circles 
    represent longitude by lunars while the squares are cases where the logbook 
    reports the crew were "working lunars" (presumably for practice) but no 
    longitude by lunar was recorded. The voyage began in September, 1841 and 
    ended back in New Bedford at the very beginning of 1845. This was a fairly 
    typical whaling voyage of that time period.
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