If you'd like to have fun with astronomy on the cheap, this is your book. You make some very simple instruments (out of things like cardboard and a ruler) to perform simple astrometry (measurements of the positions of celestial objects), make some simplified models of the solar system, make a sundial, predict eclipses, etc.
If you are interested in the Astronomical Almanacs, ephemerides, or celestial mechanics but don't know how to get started in such a complex subject, this is it, start with this book. Very simple geometrical methods (like drawing the planet's orbits to scale and plotting their positions) are presented, along with a little simple trig to get you going. This is the book I started with about 30 years ago, and with this foundation and some training in higher math, I was able to progress through most of classical celestial mechanics and astrodynamics. It has been a fascinating and absorbing hobby, which has taught me much about science and math.