Annus Novus Decimal Calendar
A proposal for a non-sectarian, culturally neutral calendar system.
Astro Portal - CalSKY
The worldwide interactive online astronomical/space calendar and calculator - for friends of astronomy, as well as astronomers.
Astronomical Time Keeping
Extensive descriptions of many timing systems, with information on time zones and Julian day numbers.
Applets related to calendars and keeping time, including sidererial time.
Blue Moon Myths
Second full moon in a month, or third full moon in a single season.
Calendars through the Ages
History and FAQs of calendars, from ancient Rome to outer space. Including Julian, Gregorian, Jewish, Islamic, Chinese, and Mayan.
The encyclopaedia of calendars.
GMT: Greenwich Mean Time
Complete guide to times in every time zone in the world.
Hindu Calendar Dates 52nd Century
Explains the cosmological and astronomical influences in creating the Indian calendar.
A list of many American Indian tribe's names for months, days, and other calendar related information.
Julian Day Numbers
An explanation of the Julian day number system used by astronomers and calendricists.
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.
PlexGlobe: International Clock and Global Kit
A productivity toolkit for global users and businesses that includes world clock and calendar.
The Calendar, Leap Years and the Year 2000
An explanation of the calendar including the origin of the day, week, month and year.
The Chinese Calendar
The mathematics and rule explanation for the calendar.
The Difference Between the Millennium and Year 2000
Questions and answers to satisfy the hearts of true millennium buffs.
The Islamic Calendar
The mathematics of the calendar in Singapore.
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.
Time and Date
Information such as yearly and monthly calendars, counters, countdown, and the world clock which shows the current time in cities all over the world.
Types of Calendars
An explanation of lunar, solar, lunisolar, rule-based and other calendars.
World Holidays: Weeks and Months
Information on the origin of the week, and etymology of month and weekday names.