a calendar devised to be used for many years, as in determining the day of the week on which a given date falls.
a desk calendar with months, days, and dates that can be changed, as by adjusting various dials, so that it may be used over and over for many years.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2024
How to use perpetual calendar in a sentence
Hence, for the construction of a perpetual calendar, there must be thirty different sets or lines of epacts.
In 1849 the copyright of Levi H. Corson in a perpetual calendar or almanac was renewed by special act.Copyright: Its History and Its Law | Richard Rogers Bowker
All these, this divine claimed, are to be found in the Gospel as in a perpetual calendar of the heart.
Just before each quarter is struck, one of the two genii seated above this perpetual calendar strikes a note of warning.Nasby in Exile | David R. Locke