
Whether you are staring bleary-eyed at an alarm clock, glancing at your wristwatch to see if you are late, or booking appointments into your phone’s calendar app, most of us consult clocks many times a day. The chances are that shortly before you started reading this article you checked the time. Sharon Ann Holgate reviews A Brief History of Timekeeping: the Science of Marking Time, from Stonehenge to Atomic Clocks by Chad Orzel Prehistoric clockĪt Stonehenge, the summer solstice is marked by the sun rising next to the Heel Stone.

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