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IMO "Mary-Blewit" really blew it for this one. A very old joke, as this book has been around for a very long time. I bought it in the 60's (I think) but couldn't get it done, from this book.
I'd try the "Kindergarten of Celestial Navigation" if you can find it. It is so simple and comes with infallible worksheets; even a 5th grader could do it! I just cut out the spaces on a worksheet for the answers and laid that on a blank piece of paper. But with copy machines and personal printers today, no problem, either.

 

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"you can be adequately equipped to navigate across an ocean for about $100"
Oh yeah, that's all there is to it! Never mind the reality of trying to get a sight (actually 3 is the minimum for a fix, over several hours) from a small craft in even moderate weather (not some beach in Canada) and actually being able to catch sight of a navigable celestial body when you need to and the fact that a 4 second error in time is about a mile on a plotted LOP.
All you folks that expect to navigate celestially just because you can do the math, have a rude awakening when it comes to getting that very important fix, approaching a landfall without a sight in several days. Play around all you wish with celestial, but by all means have a good GPS that you can rely on, or you may realize that relying on celestial is going to cost you your boat, and maybe your life.