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Alex E wrote:
"The table of correction  is
0  10  20  30  40  50  60  70   80  90  100  110  120
0  -4  -4   10   6  -1   4   5  -5    4   4    3    14
The first line in  degrees, the second one in seconds."

That's fascinating! Do you have any  idea how this calibration machine worked
(or anyone else, for that matter)? Did  you watch the testing in progress?

And:
"The errors I had in star  distances are usually larger, and always positive.
In principle they can be  attributed to backlash, but I never measured
anything after the sextant  test."

Would backlash produce errors like this (a consistent pattern  varying with
location on the arc that would 'mimic' arc error)? I don't see how,  but I
wouldn't be surprised to learn that there is some sort of  explanation.

-FER
42.0N 87.7W, or 41.4N  72.1W.
www.HistoricalAtlas.com/lunars

   

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