One of the mysteries of the English language finally explained.
A calendar in which the day, the month, and the date are adjusted independently to show any combination of the three.
- ‘I could download animated clocks, perpetual calendars, a gizmo that made my keyboard clack and ding like an old Smith Corona typewriter.’
- ‘They said non-quartz, mechanical watches with features such as the minute repeater and perpetual calendar are especially in demand.’
- ‘The watches in the perpetual calendar series indicate days and months correctly for 100 years.’
- ‘Once he repaired one that had more than 400: ‘It was a special edition with a perpetual calendar calculating even the leap 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.’
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