The book that took me a very long time to look for me to have it now. The book is Principia Mathematica written by Isaac Newton. Don’t think that I was crazy of what I am going to say. It took me many years to own this book. I read and watch shows a lot about astronomy and this book was mentioned many times in most astronomy and science shows. I tried to get this book like more than 20 years, but I finally found it. I paid for it and now own it. I can’t wait to read it. This book I will keep forever. This is the book that I think that modernized astronomy and brought it more wide open to find out about the subject. I am happy today. I got it a few days ago.