A calendar is a system for organizing days, weeks, and months into a year, and also a printed or digital chart that shows these dates. People use it to plan events and keep track of time.
From Latin 'calendarium' meaning 'account book,' from 'calendae,' the first day of the Roman month when debts were recorded. Over time, the word shifted from the ledger to the system of days itself. Different cultures built their own calendars based on the sun, moon, or both.
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