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Uncovering the Secrets of Time and Number

Rhythm and number underpin our lives, from the days of the week and the times of the day to the number of letters in the alphabet. But do we ever stop to consider the deeper meaning behind these everyday realities?  In Uncovering the Secrets of Time and Number, Wolfgang Held offers a fascinating exploration of this question. He explores why there are seven days in a week and how each day ...
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Eclipses 2005 – 2017

Solar eclipses are indeed awe-inspiring spectacles if you can watch from the ideal location—in the path of a total event. Being in the right place at the right time, however, may be difficult. Here is the long-awaited handbook for both serious and amateur eclipse viewers. Wolfgang Held, director of the Kepler Observatory, provides intricately detailed information on the best places to see ...
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