NavList:

I have recently been the beneficiary of Frank's clear style with visual aids. ..

..I see said the blind man.

 I loved the illustration Frank used in the 19th century class..on our sun latitude...."the way the shadow points"....a visual thing to remember.....  (same type of thing a college professer said in my twenties doing static beam analysis....you cut the beam..it falls down..the the force arrow goes this way to hold it up).

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That reminds me of the time I was flying to Europe as a passenger on an airliner and taking sun shots with my bubble sextant through my passenger window. You have to make some additional corrections to observations taken at 450 knots with a bubble sextant which depend on the relative bearing of the object. Now an official navigator on that flight would know the heading of the plane and from the computed azimuth could determine the relative bearing for doing the correction, I didn't have that information. So.. I placed a protractor with the base on the window (so aligned with the longitudinal axis of the plane) dangled by earphone next to the window above the center of the protractor and saw where the the shadow cut the scale of the protractor. Voila, the relative bearing.

gl