NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Douglas Denny
Date: 2010 Sep 1, 14:24 -0700
Aha I see now.
Thank you George for explaining.
I for once failed to see the practical side of things and went off the deep end in theory, when I am normally encouraging a pragmatic approach to "practical" navigation and hang the theory.
Douglas Denny.
Chichester. England.
=================
Original Post:-
The question about clearing such impossible triangles is not in the
validity of the mathematical manipulations but whether the end-result has
any physical meaning.
Robin invites us to accept the meaningfulness of a "possible" triangle in
which-
LD = 103
ZDmoon = 180 - 71 = 109 (or 19º below the horixon)
ZDsun = 180 - 19 = 161 (or 71º below the horizon).
Even if we inhabited a see-through World, in which such directions could be
observed, I fail to see any way in which the angle between them could reach
a lunar distance of 103º. Robin's alternative is even less plausible than
the original triangle.
George.
contact George Huxtable, at george---me.uk
or at +44 1865 820222 (from UK, 01865 820222)
or at 1 Sandy Lane, Southmoor, Abingdon, Oxon OX13 5HX, UK.
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