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A calendar 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. The name given to each day is
known as a date. Periods in a calendar (such as years and
months) are usually, though not necessarily, synchronized
with the cycle of the sun or the moon. Many civilizations
and societies have devised a calendar, usually derived from
other calendars on which they model their systems, suited to
their particular needs. A calendar is also a physical device
(often paper). This is the most common usage of the word.
Other similar types of calendars can include computerized
systems, which can be set to remind the user of upcoming
events and appointments.
A calendar can also mean a list of planned events, such as a
court calendar.
The English word calendar is derived from the Latin word
kalendae, which was the Latin name of the first day of every
month.
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