NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: artificial horizon
From: George Huxtable
Date: 2011 Jan 25, 12:17 -0000
From: George Huxtable
Date: 2011 Jan 25, 12:17 -0000
Gary Mickus wrote-
On 1/20/11 shooting the sun using a Davis Mark 3 sextant and Davis
artificial horizon filled with glycerol with the plate glass wind screens
obtained Hs lower limb readings which were way too high. Examples: UTC
20:41'28" = 76 28', 20:49'30" = 76 20', 20:55'15" = 76 16'.
What could be causing the high readings.?
Thanks,
Gary.
===================
As we have another Gary, a prolific poster, on this list, it might be a
good idea if Gary Mickus modified his "handle" in future postings, to be
something such as "Gary M", or confusion will certainly ensue.
Gary M doesn't tell us his locality, which is essential information to
allow his question to be answered. But presuming he is not in the tropics,
or in the Southern Hemisphere, I wonder if he has simply failed to divide
his reflected angles by 2? Reflecting in a horizontal mirror has the effect
of doubling the apparent angle. But before dividing, he should first
correct the observed angle for any index error.
George.
contact George Huxtable, at george{at}hux.me.uk
or at +44 1865 820222 (from UK, 01865 820222)
or at 1 Sandy Lane, Southmoor, Abingdon, Oxon OX13 5HX, UK.
