Calendars and Timekeeping
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- ACalendar.com
- The calendar has many options with a standard monthly interface, including sunrise, sunset, and Moon phases.
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- Astro Portal - CalSKY
- The worldwide interactive online astronomical/space calendar and calculator - for friends of astronomy, as well as astronomers.
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- Astronomy by JavaScript: Sun Calculators and More
- Applets related to calendars and keeping time, including sidererial time.
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- Hindu Calendar Dates 52nd Century
- Explains the cosmological and astronomical influences in creating the Indian calendar.
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- Julian Day Numbers
- An explanation of the Julian day number system used by astronomers and calendricists.
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- Lunisolar Calendar
- Lunar calendar with lunations, from new moon to new moon, instead of months. Moon phase on each day. Chinese, Jewish, and Islamic months. Eclipses, meteors, planets, star charts. Christian, Pagan, Islamic, Hindu, and Jewish holidays.
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- Maya Calendar 2000
- The calendar was the center of Maya life and their greatest cultural achievement. To carry out their astronomical calculations they developed a sophisticated mathematical system. The Maya Calendar website is developing with the intent of providing a complete view of Maya culture.
- 11
- PlexGlobe: International Clock and Global Kit
- A productivity toolkit for global users and businesses that includes world clock and calendar.
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- The Calendar, Leap Years and the Year 2000
- An explanation of the calendar including the origin of the day, week, month and year.
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- The Difference Between the Millennium and Year 2000
- Questions and answers to satisfy the hearts of true millennium buffs.
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- The Julian and Gregorian Calendars
- Explanations of the Julian Calendar, the Gregorian Reform, the adoption of the Gregorian Calendar, the length of the tropical year and related matters.
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- Frans Maes' Sundial Site
- Describes a number of sundials of different types, mostly from northern Europe.
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- SUNDI: Sundial Design Software
- Shareware and freeware software for design and planning for the most popular.
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- Sundial - Wikipedia
- Account includes a description of the commoner types, an explanation of the relevant science and maths, and a history of sundial use.
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- Sundial Design Program
- Software to design a vertical (wall mounting) sundial for walls that face up to 60 degrees away from due-south.
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- Sundials
- Describes the history and development in Europe from the time of the Greeks. Includes literary and poetic references.
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