This book is great for anyone who (like me) has never been able to figure out stars beyond the big dipper or to understand what are the relationships of scale between stars, galaxies, clusters, etc.... Adults (including me and my father, age 73) will enjoy this book as much as (probably even more) than children.
Not only it contains celestial maps that make it easy to find the stars, but also it gives some extremely useful tricks for finding them (i.e. using your fist to estimate 10 degrees of arc). Finally, it gives some extremely well narrated and illustrated examples of relative astronomical dimensions, starting from the distance between the earth and the moon and ending with the distances between galaxies. Definitely the best first book to buy to get a clear idea what our universe is all about.