Other Uses of The Term "perpetual Calendar"
- Offices and retail establishments often display devices containing a set of elements to form all possible numbers from 1 through 31, as well as the names/abbreviations for the months and the days of the week, so as to show the current date for the convenience of people who might be signing and dating documents such as checks. Establishments that serve alcoholic beverages may use a variant that shows the current month and day, but 21 years in the past, indicating the latest legal birth date for alcohol purchases.
- Certain calendar reforms have been labeled perpetual calendars because their dates are fixed on the same weekdays every year. Examples are The World Calendar, the International Fixed Calendar and the Pax Calendar. Technically, these are perennial calendars. Their purpose, in part, is to eliminate the need for perpetual calendar tables, algorithms and computation devices.
- In watchmaking, "perpetual calendar" describes a calendar mechanism that correctly displays the date on the watch 'perpetually', taking into account the different lengths of the months as well as leap days. The internal mechanism will move the dial to the next day.
These meanings are beyond the scope of the remainder of this article.
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Famous quotes containing the words term, perpetual and/or calendar:
“There are other letters for the child to learn than those which Cadmus invented. The Spaniards have a good term to express this wild and dusky knolwedge, Grammatica parda, tawny grammar, a kind of mother-wit derived from that same leopard to which I have referred.”
—Henry David Thoreau (1817–1862)
“There is no such thing as perpetual tranquillity of mind while we live here; because life itself is but motion, and can never be without desire, nor without fear, no more than without sense.”
—Thomas Hobbes (1588–1679)
“To divide one’s life by years is of course to tumble into a trap set by our own arithmetic. The calendar consents to carry on its dull wall-existence by the arbitrary timetables we have drawn up in consultation with those permanent commuters, Earth and Sun. But we, unlike trees, need grow no annual rings.”
—Clifton Fadiman (b. 1904)