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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Dip uncertainty
From: Fred Hebard
Date: 2004 Dec 8, 10:38 -0500
From: Fred Hebard
Date: 2004 Dec 8, 10:38 -0500
Alex, This is not a difficult problem in classic optics. A theoretical treatment would suffice. We just need a competent optical physicist to address the question. Fred > Alex, > > The problem with an experimental approach would be that we are dealing > with a stochastic system. No two places or days will have quite the same > anomalies. Indeed, different regions will likely have different patterns... > > > Trevor Kenchington > > > You wrote: > > > Trevor: > > > > > >>The position that Bruce and I have been > >>supporting > >>is that anomalous dip is usually less pronounced for an observer on the > >>bridge of a modern ship or in the top of a sailing ship than for one > >>located near the waterline or aboard a small yacht. > >> > > > > The opinions seem to be split on this subject, > > and I don't see how to settle it without experimental > > data on the anomalous refraction. > > > > If the whole "anomalous part" of the anomalous refraction happens > > within few meters from the sea surface, then you and Bruce are > > right. Surely someone studied this question, but I don't know > > how to find these results. > > > > Alex. > >