Calendrical Links

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Articles on Several Calendars

Calendars

http://astro.nmsu.edu/~lhuber/leaphist.html

L. E. Doggett's article deals with several calendars used in the worls, e. g. the Gregorian, Jewish, Islamic, and Chinese calendars. (en)

Anmerkungen zu Fragen der mathematischen und technischen Chronologie

http://www.nabkal.de/abhandlungen.html

Nikolaus A. Bär gives an indepth description of the Gregorian, Julian, Islamic, Jewish, Persian, and other calendars. (de)

Die Kalenderreform Caesars. Ein Beitrag zur Geschichte seiner Spätzeit.

http://www.gnomon.ku-eichstaett.de/LAG/kalender.html

This article of J. Malitz deals with Caesar's role in the introduction of the Julian reform of the Roman calendar. (de)

Imperium Romanum: Der Römische Kalender

http://imperiumromanum.com/kultur/kalender/kalender_index.htm

Find here information not only on the Roman calendar, but also on history, army, and emperors of the Roman Empire. (de)

The Perpetual Calendar

http://www.norbyhus.dk/calendar.html

Toke Nørby's sites are mainly concentrated on philately and thus deal especially with the Julian and Gregorian calendars and the time of introduction of the latter in several countries. (en)

Islamic Calendar based on predicted lunar visibility

http://www.ummah.net/ildl/

Dr. Monzur Ahmend's article delivers information on the determination of the beginning of the month in the Islamic calendar. (en)

Calendar Studies

http://www.hermetic.ch/cal_stud.htm

Peter Meyer deals with different calendars, and the site includes links to articles of other authors. (de)

The Classic Maya Calendar and Day Numbering System

http://www.eecis.udel.edu/~mills/maya.html

An article on the Mayan calendar by D. L. Mills. (en)

Calculation of Religious Feasts

Liturgischer Kalender

http://www.salesianer.de/util/liturkal.html

Here one can create a Roman-Catholic liturgic calendar for a specified year. (de)

Calculating the Date of Easter

http://www.oremus.org/liturgy/etc/ktf/app/easter.html

An algorithm to compute the date of Easter. (en)

Пpaвocлaвный Цepкoвный Kaлeндapь

http://212.188.13.168/izdat/Kalendar/2001/1cont.htm

Russian Orthodox liturgy for a specified day. (ru)

Dates of Ash Wednesday and Easter Sunday

http://aa.usno.navy.mil/data/docs/easter.html

Form to compute the dates of Easter and Ash Wednesday of a specified Greogrian year (en)

Berechnung des Osterdatums

http://www.nabkal.de/ostrech.html

Easter date computation form (de)

Easter, Rosh Hashanah and Passover

http://quasar.as.utexas.edu/BillInfo/ReligiousCalendars.html

This (a bit spartanic looking) site of William H. Jefferys contains algorithms to compute the dates of Easter, the Jewish New Year, and Passover. (en)

Conversions and other Calculations

Calendar Converter

http://www.fourmilab.ch/documents/calendar/

J. Walker's Calendar Converter computes dates of many calendars, not only of the Gregorian, Islamic, Jewish, and Persian calendars, but also of the Indian civil calendar. Every calendar supported is described shortly. (en)

Calculation of the Ecclesiastical Calendar

http://www.smart.net/~mmontes/ec-cal.html

Form to determine feasts of Western (Catholic, Protestant, Anglican) and Eastern (Orthodox) Christian churches. There are remarks on Orthodox churches and several algorithms on Easter (Carter, Butcher, and Gauß). (en)

Kalender-365

http://kalender-365.de/

computation of annual calendars, holidays, and name days by J. Kummer (see also http://rechneronline.de/) (de)

Kalenderrechner

http://www.nabkal.de/kalrech1.html

Form to convert dates of several calendars (de)

Iranian Calendar Converter

http://www.iranchamber.com/calendar/converter/iranian_calendar_converter.php

Conversion between Persian, Gregorian, and Islamic calendars (en)

Khayam Persian Calendar Program

http://www.payvand.com/calendar/

Here one can create a Persian calendar for a specified month or year with the corresponding Gregorian dates. (en)

Julian Date Converter

http://aa.usno.navy.mil/data/docs/JulianDate.html

Form to compute dates between the Gregorian calendar and JD (en)

Юлиaнcкиe дни

http://alebedev.narod.ru/app/app04.html

Form to compute dates between the Gregorian calendar and JD (ru)

Perpetual Jewish/Civil Calendar

http://www.uwm.edu/cgi-bin/corre/calendar

Form to create a calendar for a specified Jewish year. Explanations on the program written by Alan D. Corré (University of Wisconsin-Milwaukee) can be found at http://www.uwm.edu/~corre/calendar.html. (en)

Republican/Gregorian calendar converter

http://www.napoleon.org/en/essential_napoleon/calendar/index.asp

Conversion between Republican and Gregorian calendars (en)

Calendrical Software

Gedenke

http://www.koenigsmuenster.de/rsk/gedenke.shtml

Download of the program "Gedenke" ("remember"), calculating dates and feasts of the Gregorian, Islamic (schematic version), Jewish, and coptic calendars (Königsmünster Abbey) (de)

Miscellaneous

Ostern ist ein Feiertag und kein Planet! (Kepler)

http://www.didmath.ewf.uni-erlangen.de/Verschie/Kalenderartikel.pdf

Teachers can find proposals for exercises in which pupils can find out more about "our" calendar and the Julian calendar both historically and mathematically. [PDF] (de)

Darstellung der gesetzlichen Zeit

http://www.ptb.de/de/org/4/44/441/dars.htm

The pages of the laboratory 4.32 of the Federal Office of Physics and Technics (PTB) delivers information on different aspects of calendars and time. Find out more about Summer Time, the official Civil Calendar in force in Germany etc. (de)

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