NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Douglas Denny
Date: 2010 Mar 17, 16:38 -0700
COPY: Frank Read:
Here are the Sun sights I took with an old ebony octant c.1840 this morning on the shore of Lake Michigan:
10:29:00 35-00
10:31:35 35-23
10:33:31 35-38
10:35:39 35-52
10:37:49 36-12
ENDS.
============
Using ICE (which has about five seconds delta T error) for that location and times I get True HC's for the first five readings:-
35-10.9
35-31.5
35-47.5
36-07.8
36-22.1
Dip is 3.9 and refraction 1.4 (added to get apparent altitudes):-
35-16.2
35-36.8
35-52.8
36-13.1
36-27.4
Errors:-
+16.2
+8.5
+14.8
+21.1
-10.1
Mean is +10.1
Sigma 10.8 for these five readings.
Douglas Denny.
Chichester. England.
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