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How did ancient civilizations use sundials to tell time?

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  • "A Walk Through Time." National Institute of Standards and Technology Physics Laboratory. (1/5/2009) http://physics.nist.gov/GenInt/Time/ancient.html
  • "Biological Clock of Honey Bees More Similar to Humans Than to Insects." Science Daily. 10/26/2006. (12/29/2008)http://www.sciencedaily.com/releases/2006/10/061025185102.htm
  • Chaisson, Eric and McMillian, Steve. "Astronomy Today." Prentice Hall. 1999. (1/5/2009)
  • "Circadian Rhythms." Encyclopedia Britannica. (12/29/2008) http://www.britannica.com/EBchecked/topic/118220/circadian-rhythm
  • "FAQs." National Institute of Standards and Technology Physics Laboratory. (1/5/2009) http://tf.nist.gov/timefreq/general/history.htm#Anchor-16136
  • Labak, Kim Marie. "Circadian Rhythms Influence Pet Behavior." University of Illinois College of Veterinary Medicine. 3/28/2004. (12/29/2008) http://vetmed.illinois.edu/petcolumns/showarticle_pf.cfm?id=449
  • Lennox-Boyd, Mark. "Sundials: History, Art, People, Science." Frances Lincoln LTD. 2006. (12/31/2008) http://books.google.com/books?pg=PT15&lpg=PT15&dq=sundials+early+man&sig=6g9gvA-7H0Iqgby4Fstx-ovEtsE&ct=result&id=EL0H7Sqc_tYC&ots=sFI1MtkVlQ
  • Mills, A.A. "An Introduction to the History of Timekeeping: the Leicester Time Trail." University of Leicester Department of Physics and Astronomy. 2000/2001. (12/31/2008) http://www.sundials.co.uk/~leicester.htm
  • "Simple Sundial." Museum of Science and Industry Chicago. 2001. (1/5/2009) http://www.msichicago.org/scrapbook/scrapbook_exhibits/time/educ_pages/act_sundial.html
  • Stern, David. "From Stargazers to Starships." 1/21/2008. (1/5/2009)http://pwg.gsfc.nasa.gov/stargaze/Sintro.htm
  • "Sundials." The National Maritime Museum. (12/31/2008) http://www.nmm.ac.uk/explore/astronomy-and-time/time-facts/sundials/*/viewPage/1
  • "Sundial." Encyclopedia Britannica. (12/31/2008) http://www.britannica.com/EBchecked/topic/573826/sundial
  • "Sundial and Compass." The William R. and Clarice V Spurlock Museum at the University of Illinois and Urbana-Champaign. http://www.spurlock.uiuc.edu/collections/artifact/sundialcompass.html
  • "Sundials." National Museums Liverpool. (12/31/2009) http://www.liverpoolmuseums.org.uk/nof/sun/san5.html
  • Sun Dials on the Internet Web site. (12/31/2008) http://www.sundials.co.uk/
  • "Time Zone." NationMaster.com. (1/5/2009) http://www.nationmaster.com/encyclopedia/Time-zone
  • The British Sundial Society Web site. (12/31/2008) http://www.sundialsoc.org.uk/
  • Tulpin, Christopher and Elizabeth, Tracey. "Science and Mathematics in Ancient Greek Culture." Oxford University Press. 2002. (1/5/2009) http://books.google.com/books?id=ajGkvOo0egwC&pg=PA141&dq=ancient+egypt+sundial+museum&client=firefox-a#PPA140,M1

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