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Archive for June 21st, 2011

The Summer Solstice is Here

Tuesday, June 21st, 2011

Many years ago I was teaching an introductory physics course using Paul Hewett’s Conceptual Physics textbook. There I read about the Eratosthenes’s experiment that allowed him to measure the radius of the Earth. This happened more than 2000 years ago (see Wikipedia: http://en.wikipedia.org/wiki/Eratosthenes) … Eratosthenes’s ingenuity drew my attention – to measure something so big […]

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