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    Russian formula for Casio
    From: Alexandre Eremenko
    Date: 2005 Feb 12, 16:28 -0500

    Bill,
    First, let me correct a mistake in my message:
    the following formula was published in 1973
    (not 1971 as I said before).
    Let A be the asymuth, and H the altitude.
    Then
    tan(A)=sin(LHA)/((tan(DEC)-tan(LAT)*cos(LHA))*cos(LAT)),
    cos(h)=cos(DEC)*sin(LHA)/sin(A).
    Here is the program (capitalized are the input data, lower case
    are calculator keys):
    LAT min cos x [( DEC
    
    (if DEC is of the opposite name of LAT, use + or - when input
    DEC, + for N and - for S)
    
    tan - mr tan x LHA min cos = 1/x x mr
    sin min = inv tan
    
    If negative, add 180:
    
    + 180 =
    
    Write the result as A, in degrees, with decimals.
    
    sin 1/x x mr x DEC cos = inv cos inv sex
    
    Here "sex" is the "sexagesimal" key (you also use it
    when input the data).
    The result is the altitude.
    
    I do not use this script myself (but tested on 2 examples).
    Myself, I use the usual formulas for sin(ALT)
    
    > 1.  I only see Casio 260'a at Wal-Mart etc.
    
    I suppose it is similar. Check the manual for sexagesimals.
    
    > 2.  Differences between the 250 and 260?
    
    I don't know. But you are welcome to borrow my 250 manual
    (or the calculator itself) and compare.
    
    > 3.  What is a "sexagesimal".?
    
    It is actually YOU who taught me on this list:-)
    (after I confused it with hexadecimal in one my message).
    It is numeration system with base 60.
    (degrees, minutes, seconds of angle,
    or hours minutes seconds of time).
    Casio is flexible and takes such input of, if you prefer,
    degrees, minutes and tenths of minutes.
    It also gives output in this format if you tell him to.
    
    It is a great thing even if you use it for conversion only.
    
    
    

       
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