NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: sextant index error measurement
From: Jim Martin
Date: 2006 Nov 04, 16:07 -0800
From: Jim Martin
Date: 2006 Nov 04, 16:07 -0800
Dear Bill,
It still concerns me that although you have compensated for
parallax,the effect of refraction when using the horizon would need to
be considered.The comment that the tables allow for this,in my opinion
applies only to the object.It seems to me that adjusting the sextant to
the horizon would allow for this error.In the past I have adjusted my
sextant to a nearby roof line and then taken it to the beach and found
that the true and reflected horizons were not inline.
Jim.
.
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