Hvernig var fornar siðmenningar nota sundials að segja tíma?

ot; National Institute of Standards and Technology eðlisfræði rannsóknarstofu. (2009/01/05) http://tf.nist.gov/timefreq/general/history.htm#Anchor-16136

Labak, Kim Marie. " dægursveiflum áhrif Pet Behavior. " Illinois-háskóli College of Veterinary Medicine. 2004/03/28. (2008/12/29) http://vetmed.illinois.edu/petcolumns/showarticle_pf.cfm?id=449

Lennox-Boyd, Mark. " Sundials:. Saga, Art, Fólk, Science " Frances Lincoln LTD. 2006. (2008/12/31) 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.s. " Kynning á sögu Tímareikningar:. í Leicester Tími Trail " Háskólinn í Leicester Deild eðlisfræði og stjörnufræði. 2000/2001. (2008/12/31) http://www.sundials.co.uk/~leicester.htm

" Simple Sundial. &Quot; Museum of Science and Industry Chicago. 2001. (2009/01/05) http://www.msichicago.org/scrapbook/scrapbook_exhibits/time/educ_pages/act_sundial.html

Stern, David. ". Frá Stargazers að Starships " 2008/01/21. (2009/01/05) http://pwg.gsfc.nasa.gov/stargaze/Sintro.htm

" Sundials. &Quot; The National Maritime Museum. (2008/12/31) http://www.nmm.ac.uk/explore/astronomy-and-time/time-facts/sundials/*/viewPage/1

"Sundial." Encyclopedia Britannica. (2008/12/31) http://www.britannica.com/EBchecked/topic/573826/sundial

". Sundial og Compass " The William R. og Clarice V Spurlock-safnið við Háskóla Illinois og Urbana-Champaign. http://www.spurlock.uiuc.edu/collections/artifact/sundialcompass.html

" Sundials. " National Museums Liverpool. (2009/12/31) http://www.liverpoolmuseums.org.uk/nof/sun/san5.html

Sun Dials á Internet vefsíðu. (2008/12/31) http://www.sundials.co.uk/

" Tímabelti. &Quot; NationMaster.com. (2009/01/05) http://www.nationmaster.com/encyclopedia/Time-zone

The British Sundial Society vefsvæði. (2008/12/31) http://www.sundialsoc.org.uk/

Tulpin, Christopher og Elizabeth, Tracey. " Vísindi og stærðfræði í gríska menningarmálaráðuneytið. " Oxford University Press. 2002. (2009/01/05) http://books.google.com/books?id=ajGkvOo0egwC&pg=PA141&dq=ancient+egypt+sundial+museum&client=firefox-a#PPA140,M1

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