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    Re: Index Card for Trig/Log Table
    From: Andr�s Ruiz
    Date: 2009 Sep 10, 07:47 +0200

    For Lat = 34�10'=34.1667�
    LOG(COS(RAD(Lat))) = -0.0823
    And table vlue is:
    100000*LOG(10*COS(RAD(Lat))) = 91771.9422 = 91772
    Where LOG is the logarithm to base 10
    
    Andr�s Ruiz
    Navigational Algorithms
    http://sites.google.com/site/navigationalalgorithms/
    
    
    
    -----Mensaje original-----
    De: navlist@fer3.com [mailto:navlist@fer3.com] En nombre de Greg Rudzinski
    Enviado el: jueves, 10 de septiembre de 2009 2:47
    Para: NavList
    Asunto: [NavList 9691] Re: Index Card for Trig/Log Table
    
    
    Hewitt,
    
    I'm using a U.S. Naval Institute 1959 edition hard cover table that
    contains a great set of easy reading tables. Ebay has some for under
    $10. My traveling trig/log table is a paperback Earl Milton Bigsbee
    1977 edition that fits in the sextant box nicely but is a little bit
    hard to read due to the small print size.
    
    Greg
    
    On Sep 9, 2:12�pm, Hewitt Schlereth  wrote:
    > Really interesting, Greg. What log/trig tables are you using? �-Hewitt
    >
    > On 9/8/09, Greg Rudzinski  wrote:
    >
    > > An index card is handy when performing sight reduction with a trig/log 
    table. I set my card up with pre computed entries that are good for a few 
    hours of Sun celestial. The highlighted portions of the attached index card 
    photos show what can be pre calculated before an observation is performed. 
    The remaining computations can be performed at a leisurely pace in less than 
    four minutes. The result is accurate to four places even when the the SIN 
    product is calculated by slide rule. I like the trig/log tables because they 
    are compact enough to fit into my sextant case along with a K&E 4070-3 slide 
    rule .
    
    
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