Instruct: Classify the given review as either positive or negative.
Query: Excellent book, but dated

A wonderful book full of equations. Excellent commentary on how to make calculations and the use of calculators. However, the data in the book is based on epoch 1990 and is out dated. With this being 2009, the data should be based on epoch J2000.0, and, with this epoch ending soon, the book should be updated to epoch J2010.0. This is just a fall back and calculations can still be made, but the resulting numbers are much larger to deal with. Otherwise, this is a valuable book for the equations and calculations.