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    Re: Position by rainbow?
    From: Don Seltzer
    Date: 2017 Aug 14, 09:56 -0400
    Which leads to the question which part of the rainbow is 42°?
    It seems that the red ring is 42°, while the visible blue is 40°

    Don Seltzer

    On Mon, Aug 14, 2017 at 1:53 AM, Frank Reed <NoReply_FrankReed@fer3.com> wrote:

    Yes, indeed. It's not very accurate for an altitude, but given that caveat it has some use. And I mention this in my Modern Celestial Navigation classes! The center of the rainbow is identical to the anti-sun spot in the sky: opposite in azimuth and negative altitude. And the primary rainbow itself is 42° away from that anti-sun point. As I say, this is only marginally useful as an altitude, but it can be quite useful for a quick visual compass check. 

    Frank Reed

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