One of the mysteries of the English language finally explained.
1A calendar that can be adjusted to show any combination of day, month, and year, and is therefore usable year after year.
- ‘The watches in the perpetual calendar series indicate days and months correctly for 100 years.’
- ‘The second face gives the date in the form of a perpetual calendar, with automatic adjustments for leap years.’
- ‘This kind of calendar is called a perpetual calendar.’
- ‘Once he repaired one that had more than 400: ‘It was a special edition with a perpetual calendar calculating even the leap years.’’
- ‘They said non-quartz, mechanical watches with features such as the minute repeater and perpetual calendar are especially in demand.’
- ‘I could download animated clocks, perpetual calendars, a gizmo that made my keyboard clack and ding like an old Smith Corona typewriter.’
- 1.1 A set of tables from which the day of the week can be reckoned for any date.
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