On the plus side there are a lot of clear explanations, good pictures and a good overview of the general concepts involved.
However, the book is less than 200 pages long, and there is a bit of fluff and padding.
If there was an updated edition, the most useful addition would be to expand the section in "Amateur Viewing" on Star Charts. The book itself says you should have access to a "star chart", and then the following 10 pages contain some useful star charts, but only detail on 15 constellations:
Andromeda / Bootes / Cancer / Canis Major / Cassiopeia / Centaurus / Crux
Cygnus / Hercules / Leo / Orion / Saggitarius / Scorpius / Taurus / The Plough
2000 years ago Ptolemy listed 48 constellations, and I would have thought that at a minimum level, a good Astronomy Manual should have star maps for all the well-known constellations, and now we describe the sky in terms of maybe 88 constellations I see no reason why this book could not include an extra 20 pages to give details of all the constellations. After all we don't want to be less educated than our Babylonian and Greek ancestors! The 88 constellations are listed in Appendix 1, that is it.
I would also add that the appendices 5.1 and 5.2 of Star Maps from the Northern and Southern hemispheres are a great idea, but spreading this over 8 pages instead of squashing it in to 2 pages would have been much more pleasant to view.
Finally, I thought coverage of Radio astronomy and CMB (Cosmic Microwave Background) was too slight.
So basically, the book is a great idea, but needs a revised version to beef up the information it provides.