Definition of perpetual calendar in English:

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perpetual calendar

noun

1A calendar that can be adjusted to show any combination of day, month, and year, and is therefore usable year after year.
Example sentences
  • This kind of calendar is called a perpetual calendar.
  • The second face gives the date in the form of a perpetual calendar, with automatic adjustments for leap years.
  • Once he repaired one that had more than 400: ‘It was a special edition with a perpetual calendar calculating even the leap years.’
1.1A set of tables from which the day of the week can be reckoned for any date.
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