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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Plumb-line horizon vs. geocentric horizon
From: Frank Reed CT
Date: 2005 Feb 10, 03:44 EST
From: Frank Reed CT
Date: 2005 Feb 10, 03:44 EST
Chas asked of a plumb-line in this context:
"Is it a direction defined by a
plumb bob suspended from a cord or the
local vertical?"
plumb bob suspended from a cord or the
local vertical?"
Yes and yes. Same thing. Also note that a still fluid will settle into a
configuration where its surface is everywhere perpendicular to the local
plumb-lines. This means that the local visible horizon at sea or on a large body
of water or the surface of a pan of fluid as in an artificial
horizon will make an excellent surrogate for the plumb-line.
-FER
42.0N 87.7W, or 41.4N 72.1W.
www.HistoricalAtlas.com/lunars
42.0N 87.7W, or 41.4N 72.1W.
www.HistoricalAtlas.com/lunars
