Tid (kronologi), tidssystemer og standarder

A popular look at the life of John Harrison - the man who invented the first marine chronometer.

Prominent scientists and philosophers of science address contemporary debates on the nature of Time. Their contributions freely discuss its unity and reality, its compatibility with the orders of classical philosophy (present, past and future) and with the disputed idea of free will (Volume 1). They also present a detailed and updated state of the role of Time in the so-called exact sciences: biology - or more precisely genetics, evolution, neurosciences, natural and artificial intelligence (Volume 2) , and physics - relativity, quantum mechanics and quantum gravity, and cosmology (Volume 3).

The revolution is here. In breakthrough after breakthrough, pioneering physicists are unlocking a new quantum universe which provides a better representation of reality than our everyday experiences and common sense ever could. The birth of quantum computers - which, like Schrödinger's famous dead-and-alive cat, rely on entities like electrons existing in a mixture of states - is starting to turn the computing world on its head.In his fascinating study of this cutting-edge technology (first published as Computing with Quantum Cats and now featuring a new foreword), John Gribbin updates his previous views on the nature of quantum reality, arguing for a universe of many parallel worlds where 'everything is real'. Looking back to Alan Turing's work on the Enigma machine and the first electronic computer, Gribbin explains how quantum theory developed to make quantum computers work in practice as well as in principle. He takes us beyond the arena of theoretical physics to explore their practical applications - from machines which learn through 'intuition' and trial and error to unhackable laptops and smartphones. And he investigates the potential for this extraordinary science to allow communication faster than light and even teleportation, as we step into a world of infinite possibility.

Does you child know how many dimes make a dollar? You can count on this workbook to cover coin values and other skills pertaining to money. You can also count on being surprised at how much your child will learn about time and fractions in this lively, 64-page skill-building workbook. The skills typically taught in Grades 1 and 2 are right here: counting and comparing amounts of money to 99 cents, telling time by the hour, half hour, and quarter hour, plus identifying halves, thirds, and fourths of regions and groups. The workbook is aligned with the Common Core State Standards for Mathematics, a comprehensive and progressive set of learning objectives created to help students succeed in math. At the bottom of each workbook page is a cross-reference to the Common Core grade level and "domain" or skill area that the activity practices. The workbook is also consistent with Principles and Standards for School Mathematics, a publication by the National Council for Teachers of Mathematics (NCTM), and it is compatible with Singapore math pedagogy. The lessons are planned in learning sequence; skills introduced in one lesson build on those taught in previous lessons. It's a perfect way to introduce, review, and maintain essential math skills.

An endlessly fascinating, beautifully designed survey of time?how long things take, how long things last, and how we spend our daysOur relationship to time is complex and paradoxical: Time stands still. Time also flies. Tomorrow is another day. Yet there's no time like the present. We want to do more in less time, but wish we could slow the clock. And despite all our time-saving devices?iPhones, DVRs, high-speed trains?Americans feel that they have less leisure time than ever.In an era when our time feels fractured and imperiled, The Book of Times encourages readers to ponder time used and time spent. How long does it take to find a new mate, digest a hamburger, or compose a symphony? How much time do we spend daydreaming, texting, and getting ready for work? The book challenges our beliefs and urges us to consider how, and why, some things get faster, some things slow down, and some things never change (the need for seven to eight hours of sleep).Packed with compelling charts, lists, and quizzes, as well as new and intriguing research, The Book of Times is an addictive, browsable, and provocative look at the idea of time from every direction.

2019 Reprint of 1927 Edition. Full facsimile of the original edition, not reproduced with Optical Recognition software. Dunne, a British soldier, aeronautical engineer and philosopher describes in this work his experiment with precognitive dreams and builds on them a theory of time which he later called Serialism. First published in March 1927, the book was widely read and influenced the imaginative literature of the day. An Experiment with Time divides into two main topics. The first half of the book describes a number of precognitive dreams, most of which Dunne himself had experienced. His key conclusion was that such precognitive visions foresee future personal experiences by the dreamer and not more general events. The second half develops a theory to try and explain the dreams. Dunne's starting point is the observation that the moment of "now" is not described by science. Contemporary science described physical time as a fourth dimension and Dunne's argument led to an endless sequence of higher dimensions of time to measure our passage through the dimension below. Accompanying each level was a higher level of consciousness. At the end of the chain was a supreme ultimate observer.According to Dunne, our wakeful attention prevents us from seeing beyond the present moment, whilst when dreaming that attention fades and we gain the ability to recall more of our timeline. This allows fragments of our future to appear in pre-cognitive dreams, mixed in with fragments or memories of our past. Other consequences include the phenomenon known as deja-vu and the existence of life after death.Dunne's ideas strongly influenced the J. R. R. Tolkien and C. S. Lewis. Both writers were members of the Inklings literary circle, and Tolkien also used Dunne's ideas about parallel time dimensions in the Lord of the Rings. Other important contemporary writers who used his ideas included John Buchan, James Hilton, his old friend H. G. Wells, Graham Greene and Rumer Godden.

Time surrounds us. It defines our experience of the world; it echoes through our every waking hour. Time is the very foundation of conscious experience. Yet as familiar as it is, time is also deeply mysterious. We cannot see, hear, smell, taste, or touch it. Yet we do feel it-or at least we think we feel it. No wonder poets, writers, philosophers, and scientists have grappled with time for centuries.In his latest book, award-winning science writer Dan Falk chronicles the story of how humans have come to understand time over the millennia, and by drawing from the latest research in physics, psychology, and other fields, Falk shows how that understanding continues to evolve. In Search of Time begins with our earliest ancestors' perception of time and the discoveries that led-with much effort-to the Gregorian calendar, atomic clocks, and "leap seconds." Falk examines the workings of memory, the brain's remarkable "bridge across time," and asks whether humans are unique in their ability to recall the past and imagine the future. He explores the possibility of time travel, and the paradoxes it seems to entail. Falk looks at the quest to comprehend the beginning of time and how time-and the universe-may end. Finally, he examines the puzzle of time's "flow," and the remarkable possibility that the passage of time may be an illusion.Entertaining, illuminating, and ultimately thought provoking, In Search of Time reveals what some of our most insightful thinkers have had to say about time, from Aristotle to Kant, from Newton to Einstein, and continuing with the brightest minds of today.