perpetual calendar(n = noun.group) - a chart or mechanical device that indicates the days of the week corresponding to any given date over a long period of years;
is a kind of calendar

   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.

N  chronometry, horometry, horology, date, epoch, style, era, almanac, calendar, ephemeris, register, registry, chronicle, annals, journal, diary, chronogram, clock, wall clock, pendulum clock, grandfather's clock, cuckoo clock, alarm clock, clock radio, watch, wristwatch, pocket watch, stopwatch, Swiss watch, atomic clock, digital clock, analog clock, quartz watch, water clock, chronometer, chronoscope, chronograph, repeater, timekeeper, timepiece, dial, sundial, gnomon, horologe, pendulum, hourglass, clepsydra, ghurry, chronographer, chronologer, chronologist, timekeeper, annalist, calendar year, leap year, Julian calendar, Gregorian calendar, Chinese calendar, Jewish calendar, perpetual calendar, Farmer's almanac, fiscal year, chronological, chronometrical, chronogrammatical, cinquecento, quattrocento, trecento, o'clock.

appointment calendar, calendar, calendar day, calendar method, calendar method of birth control, calendar month, calendar week, calendar year, church calendar, ecclesiastical calendar, farmer's calendar, greek calendar, gregorian calendar, gregorian calendar month, hebrew calendar, hindoo calendar, hindu calendar, hindu calendar month, islamic calendar, islamic calendar month, jewish calendar, jewish calendar month, julian calendar, lunar calendar, lunisolar calendar, mohammedan calendar, moslem calendar, muhammadan calendar, muslim calendar, new style calendar, old style calendar, perpetual, perpetual motion, perpetual motion machine, perpetual warrant, revolutionary calendar, revolutionary calendar month, roman calendar, solar calendar