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I have much enjoyed this thread.  It had forced me to reread and better
understand "Geodesy for the Layman", Chapter 2 of the new Bowditch
(especially section 204), and chapters 1 and 3 of the Admiralty Manual of
Navigation v1.  It has given me data on the local deflection of the vertical
(http://www.ngs.noaa.gov/GEOID/DEFLEC99/), an insight into the lumpiness of
the surface of the sea, and an idea of the amount of error between a
celestial fix and a reasonably accurate chart datum.  It has corrected some
mistakes in my thinking that were put there by more elementary explanations
of celestial navigation that drew lines from stars to the center of a
spherical earth.

I do not know anywhere else that I could have had this conversation but right
here in my den with you fellows.

Thanks,

Bill Murdoch

P.S. I would be a real pain in the ass if I was a student in a USPS N course
right now.

   

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