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Direct linkMadden, Sean P. – Mathematics Teacher, 2010
For thousands of years before the invention of reliable clocks, humans measured their days by the motion of the sun. Astronomically, one day was the length of time it took for the sun to return to the same position in the sky. With the advent of precise mechanical chronometers such as Harrison's timekeepers (Sobel and Andrewes 1998), which ran at…
Descriptors: Astronomy, Graphing Calculators, Technology, Mathematics Education
