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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Refraction. was: Bubble Horizon Altitude Corrections
From: Dan Allen
Date: 2004 Jul 16, 15:46 -0700
From: Dan Allen
Date: 2004 Jul 16, 15:46 -0700
M.G.J. Minnaert wrote a book entitled "Light and Color in the Outdoors" (originally in Dutch in 1937, revised until 1974) which was translated into English in 1992 and published by Springer-Verlag. There are chapters about light reflections, light refractions, the curvature of light rays in the atmosphere, the Purkinje effect, seeing underwater, illusions, fogbows, rainbows, halos, coronas, Parry's arc, Haidinger's brush, distribution of light over the sky, crepuscular rays, the zodiacal light, luminescence of the sea, and an appendix on measuring angles out of Doors. It has many fine illustrations, some equations, and tackles many optical phenomena as scientifically as possible. Highly recommended reading appropriate for such questions! To wit, there is an photo of a "superior mirage above cold water: a tanker below the horizon appears upside down in the mirage" above the horizon. Fascinating... Dan -----Original Message----- From: Navigation Mailing List [mailto:NAVIGATION-L@LISTSERV.WEBKAHUNA.COM]On Behalf Of Fred Hebard Sent: Sunday, July 11, 2004 9:07 PM To: NAVIGATION-L@LISTSERV.WEBKAHUNA.COM Subject: Re: Refraction. was: Bubble Horizon Altitude Corrections OK ladies & gentlemen. We have the case of a mirage, where the image rises above the desert floor. Are there any counter examples of an image sinking below the horizon? Fred >