- WikiProject Calendars
User-created calendars showing dates and holidays worldwide, from Wikipedia. Includes Gregorian, Chinese, and Islamic calendar dates.
en.wikipedia.org/wiki/Wikipedia:WikiProject_Calendars
- Calendars, Interpolation, Gnomons, and Armillary Spheres in the Work of Guo Shoujing (1231-1314)
(PDF)
Research paper which traces the usage of zodiacal spheres and other instruments by Chinese astronomers. In PDF format.
www.math.nus.edu.sg/aslaksen/projects/nst-urops.pdf
- Brief History of the Calendar, A
Learn about the origins and evolution of the calendar, including how different cultures and eras have reconciled the lunar and solar cycles when measuring time.
www.obliquity.com/calendar
- Date Calculator Page
Calculates the number of days between two dates, or find out what the date will be a given number of days from now.
www.cs.duke.edu/datecalc
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