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    Re: Quicker Ex-Meridian Formula for Slide Rule or Calculator
    From: John Brown
    Date: 2016 Dec 5, 03:00 -0800

    Gary wrote: OK, I understand the MX gauge point but what are the S1 and the P scales used for?

    The S1 scale is a scale of sines reading from 0 to 90 degrees from left to right and, in brackets, from 90 to 180 degrees reading from right to left. 

    The P scale is for values of SQRT (1-x^2) - a trig identity I would need to look up, but possibly used in the integral calculus.

    John

       
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