I love book discussions and especially by someone like you (and Keller, who in the dedication to his Pascal book has: "to my father, who taught me the importance of learning, and to my mother, who taught me the importance of not doing it all the time."

Btw, to thank you, I'll share this hidden gem that will help making learning smooth and fun: "Learning & Memory" by W. Wickelgren-- I've seen dozens of books on this but only this walks the walk (the author practices cognitive psychology to make his book easy to learn from, and to remember).

Have a good day,

Eagga

https://www.starpath.com/catalog/books/1992.htm

This is a workbook and records the data used for navigation by sextant to Hawai'i. Good for practice.