NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Vertical Deflection
From: Bob Goethe
Date: 2022 Dec 11, 15:06 -0800
From: Bob Goethe
Date: 2022 Dec 11, 15:06 -0800
Does anybody know of a place on the earth where, measuring the astronomical latitude and longitude as accurately as may be done, the deflection of vertical (DOV) would result in two spots being 100 meters or more apart and still having the exact same astronomical latitude and longitude?
Perhaps it would be in a fiord where the cliffs to either side both exert a DOV in opposite directions.
Of course, MEASURING this would be a problem. It would probably go beyond the capabilities of a hand-held sextant, and a permanently mounted telescope would be infeasible.
Bob
