A brief history of timekeeping : the science of marking time, from Stonehenge to atomic clocks /

Includes bibliographical references and index.

You only need to press the snooze button on your alarm a bit too often to understand the importance of good timekeeping. What you might not know is that the need to tell the time connects you to over five thousand years of human history, from the first solstice markers at Newgrange to quartz crystal oscillating in your watch today. Science underpins time: from orbital motion and axial tilt to the quantum mechanics and relativity theory that give us our ultra-precise atomic clocks. Yet time is also a social construct: the Gregorian calendar we use today is a result of complex political negotiations, reflecting the interests and priorities of those who created it. In his quirky and accessible style, Chad Orzel reveals the wondrous physics that makes time something we can set, measure and know.