- Time and Date References
- Calendar FAQ  -   Answers a
variety of questions concerning calendars and dates.
- US Naval Observatory  -   The Time Service
department is the official source of time for the United States. The site provides a number of
features regarding the measurement of time. Of particular interest is there systems of time page.
- History of Calendars  -  
Short essay by L.E. Doggett on the development of several of the major calendars still in use.
- Calendar through the Ages  -   Provides
detailed explanation for a number of calendars both those still in use and those that are not.
- Ecclesiastical Calendar  -  
If you want to know why Easter is when it is each year this is the site for you. Interesting
in providing a full explanation of how Easter is calculated involves exploring many of the crucial
issues of maintaining a calendar
- The Calendar Zone  -   This is
a site of extensive links dealing with every aspect imaginable concerning calendars.
- Virtual Calendars  -   Of chief interest
is a list of the holidays of the US and Canada and how they are determined.
- Time Series Software
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