Calendar
Calendar
Calendar (/ˈkæl.ɪn.dər/) is a system of organizing days for social, religious, commercial, or administrative purposes. This is done by giving names to periods of time, typically days, weeks, months, and years. A date is the designation of a single, specific day within such a system.
Etymology
The term calendar is derived from the Latin word calendae which means "account book," because in ancient Rome, the first day of each month was the day when debtors had to pay their debts.
Types of Calendars
There are several types of calendars used around the world. Some of the most common include the Gregorian calendar, the Julian calendar, the Hebrew calendar, the Islamic calendar, and the Hindu calendar. Each of these calendars has its own rules for determining the length of the year, the start of months, and the start of the week.
Related Terms
- Year: A period of time equal to 365 or 366 days in the Gregorian calendar.
- Month: A period of time, used with calendars, which is approximately as long as a natural period related to the motion of the Moon.
- Week: A period of seven days.
- Day: A period of 24 hours.
- Leap Year: A year, occurring once every four years, which has 366 days including 29 February as an intercalary day.
See Also
External links
- Medical encyclopedia article on Calendar
- Wikipedia's article - Calendar
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