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    Re: Lunars Tables
    From: Alexandre Eremenko
    Date: 2007 Nov 30, 20:54 -0500

    
    Dear Scott,
    
    > 1)  Are these the tables most members use
    > for reducing Lunar
    > observations or is there some other
    > preferred method/tables?
    
    I cannot say about most members, and even don't know
    how many members reduce Lunars on a regular basis,
    so I can only tell what I do.
    My prefered method on land (at home)
    is Frank's on-line Lunar
    calculator, which is quick and seems to be reliable,
    even back to XVIII century.
    Of course it is an internet-based method, and cannot
    be used at sea, unless
    your boat has an internet connection:-)
    
    When sailing or traveling with my laptop (rarely), I use a
    simple spreadsheet program (and usual almanac for the
    Moon data).
    When sailing or traveling without my laptop) I use
    my Casio fx-250D calculator and the usual almanac.
    Both the computer spreadsheet and hand calculations are
    based on an exact formula for clearing a distance which
    can be found on Frank's website, or in Chauvenet book,
    or in many other places.
    
    In general, I prefer a calculator to all kinds of tables
    for all kinds of reductions. Unfortunately this model
    Casio fx-250D has been discontinued long ago.
    And I don't know any other calculator which is so convenient
    for CelNav (because of VERY EASY sexagesimal input/output;
    it is as easy as decimal input! No other calculator that
    I know, including later models of Casio,
    has this nice feature.) Casio fx-250D sometimes can be
    found on e-bay.
    (My own works perfectly since 1987).
    
    Alex.
    
    
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