Calendar:: Humanity's Epic Struggle to Determine a True and Accurate Year (Duncan David Ewing)(Paperback)

From the earliest recorded date, people have tried to organize their lives according to the movements of the sun, moon and stars -- and have, for the most part, gotten it wrong. In his bestselling book Calendar, David Ewing Duncan takes students on an extraordinary journey through humanity's reckoning of time, ranging from the earliest calendars to the atomic clocks of today, which measure time too well for an ever-slowing Earth. Our present calendar system predates the invention of the telescope, the mechanical clock, and the concept of zero, and its development is one of the great untold stories of science. How did Pope Gregory correct a calendar which was off by at least ten full days? What did time mean to a farmer in 800 C.E.? Stonehenge, the Mayan observatories at Chichen Itza and the pyramids of Giza are all featured in this compelling volume. Duncan explores
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