NavList:

Jerry Woodward you wrote:
I own a boat and am well versed in basic navigation concepts.  I would like to learn celestial navigation.  Can anyone recommend a good book or on-line course?

I would say that someone already versed in yacht navigation needs the thinnest, simplest, most practical book written by a proven yacht navigator they can find.  For a long time the ‘classic’ was Mary Blewitt’s (Pera’s) ‘Celestial Navigation for Yachtsmen’.  Her book is very practical, but her diagrams come from a time when colour printing was expensive, so are small by today's standards and in black and white. 
https://www.telegraph.co.uk/news/obituaries/1366813/Mary-Pera.html  . 

A more recent addition is Tom Cunliffe’s ‘Celestial Navigation’
https://en.wikipedia.org/wiki/Tom_Cunliffe.

Both books follow roughly the same path, but Cunliffe follows the modern style of including a large number of good sized coloured diagrams and photographs of what you can expect to see using your sextant.  Unfortunately, Cunliffe also follows the modern style of not including an index, but it’s hardly necessary.  DaveP https://sabre27tiki.wordpress.com/sabre-27-details/