This book has been long recommended by various financial publications relating to commodity trading using Gann techniques where it is said that time is more important than price and thats why I purchased it. It gives a detail understanding of man's quest to have accurate time down to one-miooionth of a second! It explains the need for accurate time down to such small increments for its particular user group. In the final chapters, time is dealt with in relation to mathematics, physics and astronomy. I did not find it to have much value to Wall Street operations, but as a science book, it is great in its own right.