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    Position by rainbow?
    From: David C
    Date: 2017 Aug 13, 22:34 -0700

    This morning I saw an excellent rainbow. It was bright and a complete semicircle. It occurred to me that if I calculated the position of the of the sun and measured altitude of the top of the arch with a bubble sextant I could use the physics of rainbows to determine my position.

    Then I had doubts. I looked up the wikipedia article on rainbows and became thoroughly confused.

    Can a circle of position, or even a position, be determined from observation of a rainbow?

       
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