Calendars
- Computation of Sunrise, Sunset and Twilight Times Calculates the length of daylight for your particular location, when twilight begins and ends, sunrise and sunset times, the height angle of the sun at noon and the declination.
- Roman Numeral Year Dates guide to converting Roman numerals to the decimal number system.
- The 10,000 Year Calendar A perpetual calendar; may check days of the week for dates in history and in the future.
- Virtual Perpetual Calendars Provides the calendar for any year in the 19th-21st centuries. Dates for holidays in the United States and Canada from 1995-2010 may also be checked.
- World Public Holidays Database search listings of public holidays by country and year.
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