'Perpetual calendar' definitions:

Definition of 'perpetual calendar'

noun

A chart or mechanical device that indicates the days of the week corresponding to any given date over a long period of years

From: GCIDE

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. [1913 Webster]
Unto the kingdom of perpetual night. --Shak. [1913 Webster]
Perpetual feast of nectared sweets. --Milton. [1913 Webster]
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. [1913 Webster]
Syn: Continual; unceasing; endless; everlasting; incessant; constant; eternal. See Constant. [1913 Webster]

From: GCIDE

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 [Webster 1913 Suppl.]

From: GCIDE

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.]
1. 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. [1913 Webster]
2. (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. [1913 Webster]
3. 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. [1913 Webster]
Note: Shepherds of people had need know the calendars of tempests of state. --Bacon. [1913 Webster]
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. [1913 Webster]