A Brief History of Clocks: From Thales to Ptolemy

In this history essay, the student stakes a claim for the clock being one of the most important developments in western science. The student provides an overview of early timekeeping devices and components, including celestial spheres, gears, and the water clock (clepsydra). The student describes how these tools, combined with the use of stereography and the astrolabe, contributed to astronomy, as well.
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