Do not ask me what a planisphere is doing with an ISBN, because I have absolutely no idea. I've had this for years (it was useful when spending time with my wee telescope) and hauled it out again recently for research purposes, which was when I noticed the ISBN and thought "Surely not, Goodreads can't possibly list this." BUT IT DID. So here I am to say that in close to two decades of use this has been continually helpful when looking at the southern night sky, and my only caveat is that I wish it were larger, because the text can sometimes be extremely small.