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Timepieces

Timepieces. By: Aditya Deshpande , Elias Pagones. The Sundial. Measures the time of day using the sun. Sun casts shadow on the sundial to point at the time First found in around 1500 B.C. Water clock. Also known clepsydrae Possibly oldest time-measuring instrument

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Timepieces

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  1. Timepieces By: AdityaDeshpande, Elias Pagones

  2. The Sundial • Measures the time of day using the sun. • Sun casts shadow on the sundial to point at the time • First found in around 1500 B.C.

  3. Water clock • Also known clepsydrae • Possibly oldest time-measuring instrument • Existed in Babylon and Egypt around 16th century B.C. • Most accurate and commonly used timepiece for millennia

  4. Early Mechanical Clock • First built in 14th century • Used in European monasteries • No longer needed to have human strike a bell

  5. Early Astronomical clock • Shows Earth, Sun, moon, stars, and other planets • Shows zodiac signs • Shows moon’s phases • Recently made into watches

  6. Analog Clock • Indicates time using angles • Has 30 degrees between each number • Circular scale of 12 hours • Also can serve as a scale of 60 minutes and 60 seconds, if clock has second hand

  7. Digital Clock • Displays numeric representation • 12 hour notation with AM and PM • Used LCD, LED, VFD displays • Use of analog clock has declined

  8. Work Cited • "Astronomical Clock." Wikipedia, the Free Encyclopedia. Web. 09 Sept. 2011. <http://en.wikipedia.org/wiki/Astronomical_clock>. • "Clock." Wikipedia, the Free Encyclopedia. Web. 08 Sept. 2011. <http://en.wikipedia.org/wiki/Clock>. • "Early Mechanical Clocks." Discover Clocks, for Clock Collectors and Enthusiasts. Web. 09 Sept. 2011. <http://www.discoverclocks.com/early_mechanical_clocks.html>. • "Learn About Sundials." Web. 08 Sept. 2011. <http://www.fi.edu/time/Journey/Sundials/aboutsd.htm>.

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