NavList:

Frank:

 

Thanks for your most enjoyably summary of the Navigation Weekend. It made me wish I'd been there.

 

You mentioned Joel Silverberg's talk about determining latitudes by the double altitude method, when I think you meant longitudes. I hope that he mentioned the sometimes significant effect of relative motion between the body and the observer, as Bowditch did. This was the subject of my 1985 paper in Navigation, where I derived an equation for compensating. Alas, I was later informed that the same equation was in the Admiralty Manual of Navigation volume III, out of print for some years. I was later able to confirm this from a 1938 copy. There has been much published misconception about the method by ignoring this effect.

 

Again, thanks for a most enjoyable account.

 

Jim Wilson