Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Perfect intro to the Messier list

As telescope owner for two years now, I was ready to take the next step and start viewing DSOs, in particular the Messier list. This book provides everything you need to get started hunting these celestial wonders. The photos and charts are first rate. In fact the chart layout is so helpful that I am using these instead of my sky atlas. The scope section offers useful suggestions on eyepiece choices. The Messier Marathon section is most helpful for sequencing your marathon viewing session. The book also provides a fascinating history of Messier and the other astronomers of his times, which added to my appreciation of amatuer and professional astronomy and the enjoyment of this passion.