The author published a series of science divulgative books about the study and significance of time as a physical magnitude and an historical review of the concepts of Time in diferents civilizations and in different epoques. Perhaps this precise book is the most specific and "technical" of all. It keep a far resemblance with the intention of SIr Isaac Newton who published the mathematical principles of natural philosophy but made a resumee for the non mathematical readers. THis is just the opposite case. See other titles by the same author "The nature of time" and "Time in History"