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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Dip error
From: Marcel Tschudin
Date: 2008 Dec 5, 11:46 +0200
From: Marcel Tschudin
Date: 2008 Dec 5, 11:46 +0200
On Fri, Dec 5, 2008 at 10:42 AM,wrote: > > There several kinds of mirages and not all form inverted images. See: > > http://en.wikipedia.org/wiki/Mirage There are two situations causing these types of phenomena. A strong negative temperature gradient (super adiabatic lapse rate) leads to an inferior mirage and a strong positive temperature gradient (inversion) leads to a superior mirage or even to a mock mirage. In both of these two cases it depends on the geometrical situation between the abnormal temperature gradient and the observer whether there appears only a geometrical deformation, like towering, or a mirror image. A strong inversion my even lead to infinite refraction and thus to a blank or blind strip. Marcel --~--~---------~--~----~------------~-------~--~----~ Navigation List archive: www.fer3.com/arc To post, email NavList@fer3.com To , email NavList-@fer3.com -~----------~----~----~----~------~----~------~--~---