000			01369 a2200181 4500
008			230505b |||||||| |||| 00| 0 eng d
020			_a9780861542154 (PB)
041			_aeng
080			_a930.1 _bORZ
100			_aOrzel, Chad
245			_aA brief history of timekeeping _bthe science of marking time, from Stonehenge to Atomic Clocks
260			_bOneworld Publications _c2022 _aLondon
300			_a324p
520			_aYou 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 gives us our ultra-precise atomic clocks. Yet time is also socially decided: the Gregorian calendar we use today is a result of complex political negotiations. The ancient Maya used sophisticated astronomical observations to produce a calendar system unlike any other in the world. In his quirky and accessible style, Chad Orzel reveals the wondrous physics that makes time something we can set, measure and know
650			_aTime measurements History _aHistory
690			_aGeneral
942			_cBK
999			_c59783 _d59783