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What are the basics of Spherical Trigonometry?

April 26, 2017basics spherical trigonometry

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What are the basics of Spherical Trigonometry?

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On Sat, 18 Dec 1993 03:11:53 GMT said: >Hey all, > A while back I asked about calculating chord factors. I found the >equation that without which I don’t think I could have done it (by the way I >was successful)– it’s a formula for calculating w/any spherical right >triangle. The formula is sin a = sin A * sin c. > A > / | > c / |b > / | > / | > B–a–C >I’m sure you’re all familiar w/it, but is there any other equation that would >be just as helpful. This is by Napier’s rules. Here is Napier’s circle: c-c A-c B-c b a where -c means the complement (or 90 degrees – (minus) the arclength measure). A, B are angles, C is the right angle and a, b, c are the sides opposite A, B, and C, respectively. There are two rules: Rule 1: The sine of any unknown part is equal to the product of the cosines of the two known opposite parts. Or sin = cos * cos of the OPPOSITE parts. Rule 2: The sine of any unknown part is equal to the product of the tangents of its two known