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  • 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