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    7 ways to determine longitude
    From: Dan Allen
    Date: 2003 Dec 24, 07:31 -0800

    I have just started to read an old book called "Spherical and Nautical
    Astronomy", a two volume set by William Chauvenet who was a professor
    at Washington University in St. Louis.  My copy was printed in 1903 but
    it appears that it is just a reprint of an 1863 edition.
    
    Chapter 7 is "Finding Longitude by Astronomical Observation" where it
    lists seven different methods, which are:
    
    "1st method - by portable chronometers
      2nd method - by signals
      3rd method - by the electric telegraph
      4th method - by moon culminations
      5th method - by azimuths of the moon, or transits of the moon
                   and a star over the same vertical circle
      6th method - by altitudes of the moon
      7th method - by lunar distances"
    
    By chronometers it means chronometric expeditions: taking a chronometer
    from Greenwich to Boston and comparing mean noon times.  By signals it
    includes eclipses, occultations of Jupiter's moons, and terrestrial
    signals.
    
    Interesting.
    
    Dan
    
    
    

       
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