Which text?

Szebehely's Theory of Orbits. Check the Clavius bibliography for more info:

http://www.clavius.org/bibbooks.html

It goes into great depth regarding translunar trajectories. Some people still teach out of Moulton.

I took those courses because I had to, not because any of them was anything I particularly thought I cared about.

I've got the "Fundamentals of Astrodynamics" by Bate, White, & Mueller.
Lovely book!

Yes. Fundamentals is the only book I would recommend to the non-practitioner.

It was my introduction to solving intractable math problems by iteration.

Szebehely treats the treats the translunar trajectory as a special case of the restricted three-body problem, which has an analytical solution. However I prefer to burn CPU cycles instead of neurons, so I opt for the computational methods.

If you're thinking of another text, please tell me! I wants it, me precious!

There's a sort of "diet Szebehely" text out there, Adventures in Celestial Mechanics, that is more along the lines of what people want who aren't planning to do this for a living.

But, then, I'm still giggling over the Flat Earth Society

So if the earth is flat, does it still spin on bearings? If so, what keeps us from sliding off the rim? Oh, right, Mr. Rene doesn't believe in centripetal force either.