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    Re: refraction
    From: Chuck Taylor
    Date: 2007 Jan 5, 09:11 -0800

    --- Alexandre E Eremenko wrote:
    
    >... The law says that the ratio of sines of
    > the two angles is constant. The problem is that the
    > Greeks did not have sines! Sines were invented by
    > the Arabs some time in VIII century.
    
    It would appear that a Hindu by the name of
     ryabha a (476-550 AD) wrote about sines
    before that. 
    
    http://www.reference.com/browse/wiki/Aryabhata
    
    Best regards,
    
    Chuck Taylor
     48 degrees N
    122 degrees W
    
    
    
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