The Collaborative International Dictionary
Perpetual \Per*pet"u*al\, a. [OE. perpetuel, F. perp['e]tuel, fr. L. perpetualis, fr. perpetuus continuing throughout, continuous, fr. perpes, -etis, lasting throughout.] Neverceasing; continuing forever or for an unlimited time; unfailing; everlasting; continuous.
Unto the kingdom of perpetual night.
--Shak.
Perpetual feast of nectared sweets.
--Milton.
Circle of perpetual apparition, or Circle of perpetual occultation. See under Circle.
Perpetual calendar, a calendar so devised that it may be adjusted for any month or year.
Perpetual curacy (Ch. of Eng.), a curacy in which all the
tithes are appropriated, and no vicarage is endowed.
--Blackstone.
Perpetual motion. See under Motion.
Perpetual screw. See Endless screw, under Screw.
Syn: Continual; unceasing; endless; everlasting; incessant; constant; eternal. See Constant.
Perpetual calendar \Per*pet"u*al cal"en*dar\ A calendar that can be used perpetually or over a wide range of years. That of Capt. Herschel covers, as given below, dates from 1750 to 1961 only, but is capable of indefinite extension. PERPETUAL CALENDARDay of the monthJan. Oct.Apr. July Jan.Sept. Dec.JuneFeb. Mar. Nov.Aug. Feb.MayDay of the Week 18152229abcdefgMon. 29162330gabcdefTues. 310172431fgabcdeWed. 4111825[nbsp]efgabcdThur. 5121926[nbsp]defgabcFri. 6132027[nbsp]cdefgabSat. 7142128[nbsp]bcdefgaSun.
=========================================================================== To find the day of the week corresponding to any date, find the small letter directly under the month and opposite the day of the month; the same small letter also appears in the vertical column that contains the number of the year, and if the line in which it stands is followed out to the right, the day of the week is found. Thus, the small letter under March and opposite 18 is b; b appears again directly over 1904, and at its right is the word Friday. March 18 fell on Friday in 1904, and also in 1898, 1892, etc. The calendar has other uses, as for finding the months which begin on Sunday in a particular year, etc. |1753 |1754 |1755 |1750 |1751 |1757 |*1752 |1759 |1765 |*1760 |1761 |*1756 |1763 |1758 |*1764 |1771 |1766 |1767 |1762 |*1768 |1769 |1770 |*1776 |1777 |*1772 |1773 |1774 |1775
Calendar \Cal"en*dar\, n. [OE. kalender, calender, fr. L. kalendarium an interest or account book (cf. F. calendrier, OF. calendier) fr. L. calendue, kalendae, calends. See Calends.]
An orderly arrangement of the division of time, adapted to the purposes of civil life, as years, months, weeks, and days; also, a register of the year with its divisions; an almanac.
(Eccl.) A tabular statement of the dates of feasts, offices, saints' days, etc., esp. of those which are liable to change yearly according to the varying date of Easter.
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An orderly list or enumeration of persons, things, or events; a schedule; as, a calendar of state papers; a calendar of bills presented in a legislative assembly; a calendar of causes arranged for trial in court; a calendar of a college or an academy.
Note: Shepherds of people had need know the calendars of tempests of state.
--Bacon.Calendar clock, one that shows the days of the week and month.
Calendar month. See under Month.
French Republican calendar. See under Vend['e]miaire.
Gregorian calendar, Julian calendar, Perpetual calendar. See under Gregorian, Julian, and Perpetual.
WordNet
n. a chart or mechanical device that indicates the days of the week corresponding to any given date over a long period of years
Wikipedia
A perpetual calendar is a calendar valid for many years, usually designed to allow the calculation of the day of the week for a given date in the future.
For the Gregorian and Julian calendars, a perpetual calendar typically consists of one of two general variations:
- 14 one-year calendars, plus a table to show which one-year calendar is to be used for any given year. These one-year calendars divide evenly into two sets of seven calendars: seven for each common year (year that does not have a February 29) that starts on each day of the week, and seven for each leap year that starts on each day of the week, totaling fourteen. (See Dominical letter for one common naming scheme for the 14 calendars.)
- Seven (31-day) one-month calendars (or seven each of 28–31 day month lengths, for a total of 28) and one or more tables to show which calendar is used for any given month. Some perpetual calendars' tables slide against each other, so that aligning two scales with one another reveals the specific month calendar via a pointer or window mechanism.
The seven calendars may be combined into one, either with 13 columns of which only seven are revealed, or with movable day-of-week names (as shown in the pocket perpetual calendar picture.
Note that such a perpetual calendar fails to indicate the dates of moveable feasts such as Easter, which are calculated based on a combination of events in the Tropical year and lunar cycles. These issues are dealt with in great detail in Computus.
An early example of a perpetual calendar for practical use is found in the manuscript GNM 3227a. The calendar covers the period of 1390–1495 (on which grounds the manuscript is dated to c. 1389). For each year of this period, it lists the number of weeks between Christmas day and Quinquagesima. This is the first known instance of a tabular form of perpetual calendar allowing the calculation of the moveable feasts which became popular during the 15th century.
Usage examples of "perpetual calendar".
Authors interested in writing historical fiction that involves Jewish characters should use a perpetual calendar to locate the dates of the festivals for the year in question.
When she found her father's perpetual calendar we let her be fascinated with that because it seemed more .
I thumbed to the index and found the page numbers for a perpetual calendar.
Bet he has that sad day circled in funeral black on his perpetual calendar.
When he stopped drinking, she gave him a calendar, what she had called a perpetual calendar that he could use forever.
With a seven-day week, we can have a perpetual calendar if each month has eight weeks.
Austrian was in his desk chain again, holding his head in his hands, staring at the polished black top of the desk and the towel of hypodermic needles and the small black perpetual calendar and the pen set and the hero doodads that were on the desk.
Mary's back bar became a kind of shrine to the absurd items people brought from Earth, such as a digital perpetual calendar geared to 365 days in a year, a pair of ice skates, a ballroom dancing trophy, and a snow globe depicting the Historic Astoria Column of Astoria, Oregon.
We used to test him with a perpetual calendar and he was never wrong.