Astronomical Calendars

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• Astronomical Calendars 
  Essay which defines what a year is and looks at the different celndar systems in use.
  http://www.maa.mhn.de/Scholar/calendar.html - More

• Primer on the Evolution of Astronomical Calendars 
  Essay by Bryan C. Bates which traces the development of astronomical calendars from ancient times to the present.
  http://www.cpluhna.nau.edu/Tools/archaeoastronomy.htm - More

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