Extensive descriptions of many astronomical time keeping systems, with information on time zones and Julian day numbers.
http://www.maa.mhn.de/Scholar/times.html
Features different views of the night sky, constellations, stars, planets, and other celestial wonders.
http://www.newarkmuseum.org/planetarium/pages/astrocal.html
Articles on the Gregorian and Julian calendars, the ISO date format, the Julian day number system, the Maya calendar, the Goddess lunar calendar, the Liberalia Triday Calendar and ...
http://hermetic.nofadz.com/cal_stud.htm
History and FAQs of calendars, from ancient Rome to outer space. Including Julian, Gregorian, Jewish, Islamic, Chinese, and Mayan.
http://webexhibits.org/calendars/
Published by Cambridge University Press. Gives a unified algorithmic presentation of the Gregorian, ISO, Julian, Coptic, Ethiopic, and Islamic civil calendars.
http://emr.cs.uiuc.edu/home/reingold/calendar-book/index.shtml
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