'A present that is common throughout the whole universe does not exist.' Īristotle: Time is the measurement of change. Hence, if you look at her through a telescope, or receive a radio communication from her, you know what she was doing 4 years ago rather than what she is doing now.' If your sister is on Proxima b, however, light takes 4 years to reach you from there. If you ask what your sister, who is in the room with you, is doing now. What is your sister doing now on Proxima b?. 'What is happening 'now' in a distant place? Imagine for example, that your sister has gone to Proxima b, the recently discovered planet that orbits a star at approximately 4 light-years' distance from us. in the elementary laws that describe the mechanisms of the world, there is no such difference.' The difference between past and future, between cause and effect, between memory and hope, between regret and intention. 'Why, to us, is the past so different from the future? Nineteenth- and twentieth-century physics engaged with and ran into something unexpected and disconcerting - much more so than the relatively marginal fact that time passes at different speeds in different places. The equations tell us how things change as the time measured by a clock passes.'

What does this t stand for? It stands for the number measured by a clock. 'It has long been the convention to indicate time in equations with the letter t (the word for 'time' begins with t in Italian, French, and Spanish, but not in German, Russian, or Mandarin). As a crime novel, we are going in search of the guilty party: the culprit who created time.' the return journey, back toward the time lost in the first part of the book when pursuing the elementary grammar of the world.

an empty, windswept landscape almost devoid of temporality. In the first, I summarize what modern physics has understood about time. 'The book is divided into three unequal parts. Hopefully, it's interesting in a unique way. In this fine tradition, I thought I'd once again try my hand at being a Jessica Hagy by providing an index card for each chapter of The Order of Time. I have often combined these two likes in my book reviews: Only Humans Need Apply, FLOW, Codermetrics, Shutting Up, The Infinite Resource, High-Tech, High-Touch Customer Service, SPIN Sucks, and Junkyard Planet.

I also like Jessica Hagy's This is Indexed site where she shares pithy insights via index cards. One day in the future, time travel will be scientifically possible long ago. 'I Love My Life,' Nearly Human, Todd Rundgren, 1989. Time is the dividing line between what is true and what is not true.' We would make our lives a perfect thing, if not for time. We would make this world a perfect place. 'What would we do with time off our backs?

Carlo rovelli the order of time review