Perform some mental "magic" tricks based on math and the calendar.
How a year is figured and who invented our calendar.
Imagine if the history of the universe, all 13 billion years of it, were put into just one year. What would that calendar look like? Carl Sagan, the famous astronomer, made this one.
This site includes lots of information that is time and date related, such as yearly and monthly calendars, counters, countdown, and the world clock which shows current time in cities all over the world.
How different parts of the world made different kinds of clocks based on where they lived and what kind of weather they had to predict.
The ancient calendar, its origin, problems, and development, plus a look at the names of days of the week
Converts Japanese to Western calendar dates.
All about calendars, different kinds, astronomical time, and how years are counted.
Articles on the Gregorian and Julian calendars, the ISO date format, the Julian day number system, the Maya calendar, the Goddess lunar calendar, the Liberalia Triday Calendar and C functions for date conversion; plus software for calendrical conversion.
Today's date from the Gregorian calendar that we use into the calendar dates of the Mayan, French, Islamic, Hebrew, Julian, Ethiopic, Coptic, Chinese, Julian, and Discordian calendars.
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