Instruct: Classify Amazon reviews into positive or negative sentiment
Query: A must for the solar astronomer

Whether you are a beginner or experienced astronomer, amateur or pro, for shure this book contains something that you don't know, otherwise you would know everything about the sun. It is perhaps the most complete source on solar astonomy available.Of course it is written in a very "academic" style because it is intended for astrophysics graduate students and researchers, but it can be read by advanced amateurs who are not afraid of mathematical formulas.