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    Re: Position by rainbow?
    From: Francis Upchurch
    Date: 2017 Aug 14, 19:28 +0100

    In my humble opinion, the last word on rainbows and the eternal question of 
    where am I and where should I be.
    This is transcendental.
    -----Original Message-----
    From: NavList@fer3.com [mailto:NavList@fer3.com] On Behalf Of Don Seltzer
    Sent: 14 August 2017 16:24
    To: francisupchurch@gmail.com
    Subject: [NavList] Re: Position by rainbow?
    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 
    > 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
    > View and reply to this message
    >  6>
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