Beginning the calendar of the Maya (after Robert Heneling).

Beginning the Byzantine world era (Greek world era).

Beginning the Alexandrian world era (era of the Pandodorus) (after monk Pandodorus).

Beginning the Julian date.

Beginning the Egyptian calendar.

Beginning of the Jewish calendar and of the Jewish world era (after Hillel IInd Násir).

Beginning of the calendar of the Maya (after Charles P. Bowditch).

Beginning of the calendar of the Maya (after Charles H. Smiley).

Beginning of the calendar of the Maya (after Nancy K. Owen).

Beginning of the calendar of the Maya (after Maud W. Makemson).

Beginning of the calendar of the Maya (after Herbert J. Spinden).

Beginning of the calendar of the Maya (after D. H. Kelley).

Beginning of the calendar of the Maya (after Martin).

Beginning of the calendar of the Maya (after J. T. Goodman (1905 o.c.)).

Beginning of the calendar of the Maya (after Martínez (1926 o.c.)).

Beginning of the calendar of the Maya (after J. T. Goodman, Martínez, Sir John Eric S. Thompson (1950 o.c.), Nowotny (1958 o.c.).

Beginning of the calendar of the Maya (after Beyer (1937 o.c.).

Beginning of the calendar of the Maya (after Grube, Sabloff, Floyd Lounsbury, Sir John Eric S. Thompson (1935 o.c.), Floyd Lounsbury (1978 o.c.)).

Beginning of the calendar of the Maya (after Bohm Bohumil, Vladimir Bohm).

The flow time of the water is as a unit of measure of time with employed the Sumerer.

Beginning of the calendar of the Maya (after Kreichgauer).

Beginning of the calendar of the Maya (after Hochleitner).

Beginning of the calendar of the Maya (after Escalona Ramos).

Sun-dials are employed in China.

Beginning of the calendar of the Maya (after Weitzel).

Beginning of the calendar of the Maya (after Antoon Leon Vollemaere (1984 o.c.)).

Beginning of the calendar of the Maya (after Vaillant).

Amenemhet builds a water discharge clock in Egypt for Pharao Amenophis I.
In Greece, water-clocks are employed for the time measurement.

Tschou Kong, Emperor of Cina, uses for time measurement in sunshine a gnomon.

Establishment of the city Rome.
Beginning of the Varron era (after Marcus Terentius Varro).

Establishment of the city Rome.
Beginning of the Kapitolin era.

Ahas, king of Juda, lets a obelisken build as sun-dial.

The king Numa Pompilius reforms the old Roman calendar and introduces the Numanian calendar.

King Numa Pompilius died.

The king Lucius Tarquinius Priscus reforms the Numanian calendar and introduces the calendar of the Roman republic.

King Hiskia possesses a refraction sun-dial.

King Lucius Tarquinius Priscus died.

Establishment of the Persian monarchy and beginning of the Persian era.

Inauguration of the Jupiter-temple on the Kapitol in Rome.

Platon is born in Athens.

Platon sets up a water intake clock, which produces flute tones by air compression of a figure in the garden of the Athens academy.

The philosopher Platon died in Athens.

Parmenio builds a bag sun-dial.

Accession of the ruler Seleukos.
Beginning of the Seleukid era.

Aristraghos of Samos finds itself out, the earth around the sun moved.

Ptolemaios IIIrd Euergetes Ist is born.

Papirius Cursor sets up the first public sun-dial in Rome.

The Pharao Ptolemaios IIIrd Euergetes Ist reforms the Egyptian calendar and introduces the calendar of the Ptolemaios IIIrd Euergetes Ist.

The Pharao Ptolemaios IIIrd Euergetes Ist died.
The Egyptian calendar is again introduced.

Ktesibios of Alexandria manufactures an automatic water-clock, which is combined as landing on water in and water discharge clock with a wheels in Greece.

The gift, a public water-clock, of the censor Scipio Nasica is set up in Rome.

Gaius Iulius Caesar is born.

Andronikos from Kyrrhos builds the "tower of the winds" in Athens with several sun-dials at the external walls and a water-clock in the inside .

The dictator Gaius Iulius Caesar reforms the calendar of the Roman republic and introduces the Julian calendar.

The dictator Gaius Iulius Caesar is murdered in Rome.

Marcus Terentius Varro specifies the beginning of the Varron era.

Beginning of the Spanish era.

Beginning of the era of the Augustus.

The emperor Augustus reimports the calendar of the Ptolemaios IIIrd Euergetes Ist in Egypt.

Pollio Virtuvius writes a ten-volume training work over architecture and technology of its time in Rome. The ninth volume treats time measurement.

Meeting of the planets Jupiter and Saturn. After the astronomer Johannes Kepler is this the actual beginning of the Christian era.

Beginning of the Christian era (after abbot Dionysios Exiguus).

Beginning the Ethiopian calendar.

Tyros propose the earth into a coordinate system of degrees of longitude and latitude to divide.

Accession of the emperor Diocletian .
Beginning of the Diocletiani era (martyr era).
Beginning the Coptic calendar.

Council of Nicaea (today Iznik)
Definition of the spring beginning, introduction of the seven-day Jewish-Christian week and new calculation of the easter-date.

Hillel II. Násir is born.

The patriarch Hillel IInd Násir publishes the rules for the calendar computation of the Jewish calendar.

The patriarch Hillel IInd Násir died.

The Alexandrinische monk Pandodorus specifies the Alexandrin world era (era of the Pandodorus).

Anicius Torquatus Severinus Boethius is born.

On the market place of Gaza a monumental water-clock with hour impact, the Hercules clock, is set up.

Beginning of the old Persian calendar.

Anicius Torquatus Severinus Boethius builds a sun-dial and a water-clock, which to the king of the Burgunder, Gundibald are given, in the order Theoderichs, the great.

The philosopher and statesman Anicius Torquatus Severinus Boethius died.

The abbot Dionysios Exiguus specifies the Christian era.

Beginning the Armenian calendar.

Abul Kasim Muhammad ibn Abdallah is born in Mekka.

Beginning the Persian calendar and the Islamic era in Persia.

Beginning of the Islamic calendar and the Islamic era (by caliph Omar Ist).

Abul Kasim Muhammad ibn Abdalla (Mohammed) introduces the Islamic calendar due to its revealing (the Koran).

Abul Kasim Muhammad ibn Abdalla (Prophet Mohammed) died in Medina.

Accession ot the throne of the last Sassanidian ruler Yazdegar IIIrd
Beginning of the calendar of Yazdegar IIIrd

Beginning of the calendar of the Maya (after "Stele of Palenque").

Hsing and Lian Ling-Tsan build a clock with mechanical inhibition in China.

Harún al-Raschid is born in Ray.

Harún al-Raschid, caliph of Bagdad, gives to Charles, the great a water-clock with rammer and mobile figures.

The Abbasiden-caliph Harún al-Raschid died in Tus (today Moeschhaed).

Gerbert of Aurillac is born in the Auvergne.

Gerbert of Aurillac (pope Silvester IInd) builds in Magdeburg a sun-clock regulated after astronomical observations and a celestial globe.

The counting of the years after the Christian era (after abbot Dionysios Exiguus) in Europe is spread.

Gerbert of Aurillac (pope Silvester IInd) died in Rome.

The Seldschukidian ruler Dshalal ed-Din Malik Shah lets in Isfahan one astronomic observatory build.

Beginning of the calendar of Omar Chayyam and the era of Dshelal ed-Din Malik Shah.

Su Sung sets up an astronomical water-clock at the east gate of the city for Khai Sung, capital of the Sung realm.

In Damascus the famous water-clock at the east gate of the city develops.

Al Gazari builds water-clocks in the Arabian Anit.

Hali publishes a work over the building and the maintenance of water-clocks.

Emperor Frederic IInd keeps a large astronomical water-clock given from the sultan of Bagdad .

Use of the Christmas-handle (25th December) as yearly beginning in the diocese Sitten.

King Alfons Xth lets manufacture from its scientists planet boards (Alfonsin planet boards).

At the cathedral of Exeter (England) the first mechanical tower clock is taken in enterprise.

The Westminster Hall in London receives a mechanical tower clock .
The daily organization into two times twelve equal long hours is specified.

In Florenz the first public mechanical city clock is set up.

Use of the Christmas-handle (25th December) as yearly beginning in the Netherlands, Flanders, Brabant, Hainaut and in the diocese Geneva.

Churchs, town halls (city halls), monastery and towers are equipped with large wheel clocks and rammers.

Use of the Christmas-handle (25th December) as yearly beginning in the archdioezese Cologne.

Richard Wallington builds an astronomical clock with planetarium for the abbey Saint Albanus (England).

Peter Lightfoot builds an astronomical clock for the English Glason Abbey.

Jacopo de Dondi builds a public rammer clock in Padua.

London receives its first public rammer clock, Big Tom.

Use of the Christmas-handle (25th December) as yearly beginning in Aragón.

The minster of Strasbourg its first monumental, astronomical clock receives.
Giovanni de Dondi builds an astronomical clock in Padua.

Use of the Christmas-handle (25th December) as yearly beginning in Castile.

In the cathedral of Salisburg (England) a rammer clock without dial is built.

Jehan de Felains builds a tower clock with quarterly impact in Rouen.

At the cathedral place in the Moscow Kremel is inserted the first tower clock.

Into the church of Mary of Luebek the first astronomical clock is built.

The counting of the years after the Christian era (after abbot Dionysios Exiguus) by the popes is used.

Jean Liebure builds travel clocks, whose copper housings are provided with bells by J. Moulinet.

Hans Duehringer builds an astronomical apostle clock with rammer and 24-hours-dial for the church Saint Mary in Danzig.

The church of Mary of Rostock receives its first apostle clock.

Nikolaus Kopernikus is born in Thorn.

Peter Henlein is born in Nuernberg.

The Alfonsin planet boards are world-wide introduced and used later by Christoph Columbus and Tycho Brahe.

Ugo Buoncompoagni is born in Bologna.

Peter Henlein builds portable clocks in Nuernberg.

Luigi Lilio is born.
Nikolaus Kopernikus publishes the realization that the sun is located in the center of our planet system.

Erasmus Reinhold is born in Saalfeld, Thuringia.

Joseph Justus Scaliger is born.

The fitter and precision mechanic Peter Henlein died in Nuernberg.

Nikolaus Kopernikus disproves the geocentric theory and shank of starting points of the new time calculation and time measurement.

The astronomer Nikolaus Kopernikus died in Frauenburg.

In Paris a watchmaker-guild develops.
Isaac Habrecht is born in Schaffhausen.

Council of Trient
Reform of the Julian calendar.

Erasmus Reinhold publishes the Pruten boards.

Joost Buergi is born in Lichtensteig.

The astronomer and mathematician Erasmus Reinhold died in Saalfeld, Thuringia.

Use of the Circumcisions-handle (1st January) as yearly beginning in Spain.

Use of the Circumcisions-handle (1st January) as yearly beginning in France.

Johannes Kepler died in Weil der Stadt, Wuerttemberg.

Isaac Habrecht builds two monumental clocks for the minster of Strasbourg.

Use of the Circumcisions-handle (1st January) as yearly beginning in the Netherlands, Flanders, Brabant, Hainaut and in the diocese Geneva.

Der Astronom Luigi Lilio (Alysius Lilius) died.

Isaac Habrecht builds the famous Heilbronners town hall clock (city hall clock).

Ugo Buoncompagni (pope Gregory XIIIrd) published those bull "inter gravissimas".

Beginning of the Lilian date.

Beginning of the Gregorian calendar in Italy (partially), Poland, Portugal, Spain and the USA (Arizona, Florida, California, Nevada, New Mexico and Texas).

Beginning of the Gregorian calendar in France, Lorraine and the USA (Missisippi).

Beginning of the Gregorian calendar in the Netherlands (catholic part: Artois, Brabant and Zeeland).

Beginning of the Gregorian calendar in Antwerp.

Beginning of the Gregorian calendar in the Netherlands (Brabant, Flanders, Hainaut, Holland, Limburg and Zeeland).

Beginning of the Gregorian calendar in Holland.

Beginning of the Gregorian calendar in the diocese of Liege.

Beginning of the Gregorian calendar in the diocese of Augsburg.

Beginning of the Gregorian calendar in the Netherlands (Groningen).

Beginning of the Gregorian calendar in the archdiocese of Treves.

Beginning of the Gregorian calendar in Bavaria and in the dioceses: Brixen, Eichstaett, Freising, Salzburg, Regensburg and Tirol.

Beginning of the Gregorian calendar in Breisgau and in Elsass.

Beginning of the Gregorian calendar in the diocese of Basle.

Beginning of the Gregorian calendar in the duchy of Juelich-Berg.

Beginning of the Gregorian calendar in Aachen, in the diocese of Cologne (the Netherlands), in the archdiocese of Cologne (Germany) and in the city of Cologne.

Beginning of the Gregorian calendar in the diocese of Wuerzburg.

Beginning of the Gregorian calendar in the archdiocese of Mayence.

Beginning of the Gregorian calendar in the diocese of Strasbourg and in the margrave county of Baden.

Beginning of the Gregorian calendar in the diocese of Muenster and in the duchy of Cleve.

Beginning of the Gregorian calendar in Carinthia and in the Styria.

Beginning of the Gregorian calendar in Switzerland (evangelical feudal tenure and canton Unterwalden).
Joost Buergi builds high-precision clocks in Kassel.

Beginning of the Gregorian calendar in Bohemia, Moravia, Austria (partially) and Czechoslovakia (Slowakei and Tschechien).

Beginning of the Gregorian calendar in the grand duchy of Lithuania (the provinces: Grodno, Kovno, Minsk, Mohilev, Vilna and Vitebsk) and in Uznemune.

Beginning of the Gregorian calendar in Switzerland (the cantons: Fribourg, Lucerne, Schwyz, Solothurn, Uri and Zug).

Beginning of the Gregorian calendar in Lusatia and Silesia.

Beginning of the Gregorian calendar in Slowakei and Hungary (civil).

Beginning of the Gregorian calendar in the duchy of Westphalia.

Beginning of the Gregorian calendar in Poland.

Ugo Buoncompagni (pope Gregory XIIIrd) died in Rome.

Beginning of the Gregorian calendar in the diocese of Paderborn.

Beginning of the Gregorian calendar in Hungary (official).

Beginning of the Gregorian calendar in Hungary.

Re-establishment of the Julian calendar in the Netherlands (Groningen).

Henry Ester builds watches with rammer in Augsburg.

Beginning of the Gregorian calendar in Canada (Mainland Nova Scotia and New Foundland).

The German astronomer Johannes Kepler finds the error during the definition of the Christian era (after the abbot Dionysios Exiguus).

The philologist, orientalist, numismatist and historian Joseph Justus Scaliger died.

Beginning of the Gregorian calendar in the duchy of Poland.

Beginning of the Gregorian calendar in Pfalz-Neuburg.

Beginning of the Gregorian calendar in the duchy of Kurland.

Use of the Circumcisions-handle (1st January) as yearly beginning in the archdiocese Treves.

The watchmaker Isaac Habrecht died in Strasbourg.

Beginning of the Gregorian calendar in the diocese of Osnabrueck.

Johannes Kepler publishes its Rudolfin planet boards, which are the basis on observations of Tycho Brahe in Prague.

The astronomer Johannes Kepler died in Regensburg.

Beginning of the Gregorian calendar in the diocese of Hildesheim.

The mathematician Joost Buergi died in Kassel.

The French specify the zero-meridian by the kanarische Island Ferro.

Thomas Tompion is born in Northhill, England.

The church of Mary of Rostock receives its second apostle clock.

John Flamsteed is born in Derby.

Daniel Quare is born.

The first grand clock builds Hans Buschmann with the course duration of one year in Augsburg.

Beginning of the Gregorian calendar in Switzerland (canton Wallis).

Beginning of the Gregorian calendar in Switzerland (Brieg, Goms, Leuk, Rauvon, Siders, Sitten and Visp).

Beginning of the Gregorian calendar in the principality of Minden.

John Flamsteed describes for the first time the regularities of the time-equation.

The observatory in Greenwich (England) is created by astronomer John Flamsteed.

Beginning of the Gregorian calendar in the city of Strasbourg.

Abolishment of the Byzantine era and introduction of the Christian era and use of the Circumcisions-handle (1st January) as yearly beginning to Russia.

Beginning of the Gregorian calendar in Denmark, Germany (protestant part and the Swedish provinces) and Norway.

In parts of Sweden the intercalary day was forgotten on 29th February 1700 o.c., therefore the calendar in the purchase follows to the Julian calendar around one day.

Beginning of the Gregorian calendar in the Netherlands (Gelderland and Zutphen).

Beginning of the Gregorian calendar in Denmark (partially), Faeroe Islands and in Iceland.

Beginning of the Gregorian calendar in the Netherlands (Utrecht and Overijssel).

Beginning of the Gregorian calendar in the Netherlands (Drenthe, Friesland and Groningen) and Switzerland (the cantons: Basle, Bern, Biel, Genf, Muehlhausen, Neuchâtel, Schaffhausen, Thurgau and Zuerich).

Beginning of the Gregorian calendar in the Netherlands (Drenthe).

Daniel Quare builds a Aequations-grandfather clock, which indicates the middle and the true time.

Re-establishment of the Julian calendar in Canada (Mainland Nova Scotia and New Foundland).

Thomas Tompion builds a yearly clock.
The watchmaker Thomas Tompion died.

The astronomer John Flamsteed died in Greenwich, England.

Beginning of the Gregorian calendar in Switzerland (Appenzell, Glarus and the city Sankt Gallen).
The watchmaker Daniel Quare died.

Use of the Circumcisions-handle (1st January) as yearly beginning in Italy (Florenz and Pisa).

Beginning of the Gregorian calendar in Italy (Florenz and Pisa).

Use of the Circumcisions-handle (1st January) as yearly beginning in Great Britain.

Re-establishment of the Gregorian calendar in Canada (Mainland Nova Scotia and New Foundland).

Beginning of the Gregorian calendar in Great Britain and in its colonies (at the east coast of the USA, Oregon, Washington and other one), Ireland and in Canada (New Foundland and Hudson Bay Coast).

Beginning of the Gregorian calendar in Finland and Sweden (partially).

Fabre d'Eglantine is born in Carcassone.

Beginning of the Julian calendar in Turkey.

Use of the Circumcisions-handle (1st January) as yearly beginning in France.

The decree of the French national convention forms the legal basis of the French revolution calendar.

Introduction "noveau calendarier" (revolution calendars) by the French republic.

The poet Fabre d'Eglantine died in Paris.

Beginning of the French revolution calendar in the Netherlands (Limburg).

Re-establishment of the Julian calendar in the areas, those under Russian administration with exception of Finland, the areas in south Lithuania and the region Uznemune.

The decree of emperor Napoléon Ist Bonaparte for the abolishment of the French revolution calendar and re-establishment of the Gregorian calendar is published.

Abolishment of the French revolution calendar and re-establishment of the Gregorian calendar in France, Elsass, in the Netherlands (Limburg) and in the city Strasbourg.

Beginning of the Gregorian calendar in Switzerland (Praettigau).

In Greenwich (England) a time ball station is furnished.

The zero-meridian is counted provisionally by Greenwich (England) out.

In Washington (USA) a time ball station is furnished.

Beginnig of the Gregorian calendar in Alaska.

Re-establishment (for short time) of the French revolution calendar by revolutionary groups in France.

Beginning of the Gregorian calendar in Japan.

In Kiel (Germany) a time ball station is furnished.

In Bremerhaven (Germany) a time ball station is furnished.

Moses B. Cotsworth publishes the Cotsworth calendar in its book "The Rational Almanach".
In the USA the first time-signal are radiated by radio.

The zero-meridian is finally specified on Greenwich (England).

Beginning of the Gregorian calendar in China.

Beginning of the Gregorian calendar in Albania.

Beginning of the Gregorian calendar in Lithuania.

Introduction of the summer time to Germany.

Beginning of the Gregorian calendar in Turkey.

Beginning of the Gregorian calendar in Bulgaria.

Beginning of the Gregorian calendar in Israel.

Shifting of the yearly beginning in Turkey from 1st March on 1st January.

Re-establishment of the Gregorian calendar in Estland and in Russia (partially).

Re-establishment of the Julian calendar in Russia.

Re-establishment of the Gregorian calendar in Russia (Kolchak's Republic).

Beginning of the Gregorian calendar in Yugoslavia.

Re-establishment of the Gregorian calendar in Romania (Greek orthodoxer part and in Russia (eastern part).

Moses B. Cotsworth Cotsworth creates the "IFCL (International Fixed Calendar League)".

Beginning of the Gregorian calendar in Greece.

Beginning of the Gregorian calendar in Croatia.

Beginning of the Gregorian calendar in Greece.

Introduction of the Persian calendar in Persia (since 1925 Iran).

Beginning of the Gregorian calendar in the Republic of Turkey.

Abolishment of the Islamic calendar in Turkey.

Beginning of the Gregorian calendar in Egypt.

Elisabeth Achelis creates the "WCA (World Calendar Association)" in New York.

Elisabeth Achelis suggests the world calendar on a preparation conference for the calendar reform of the League of Nations.

The calendar reformer Moses B. Cotsworth died.

Mao Tse-Tung is born.
Abolishment of the Christian era and introduction of the yearly counting since birth of Mao Tse Tung to China.

Elisabeth Achelis withdrew as a president of the "WCA (World Calendar Association)".

Introduction of the Persian calendar in Afghanistan.

Arthur Hill is a president of the "IWCA (International World Calendar Association)".

In the International Geophysical Year the modified Julian date is introduced.y/p>

Beginning of the truncated Julian date.

Charles Clay of Bewdley is a president of the "IWCA (International World Calendar Association)".

Charlotte Clay-Ireland is a president of the "IWCA (International World Calendar Association)".

Peter Meyer publishes the Annus Novus Decimal Calendar in co-operation with the "Empire of Atlantium".

Norman C. Lindhjem of Bend is a president of the "IWCA (International World Calendar Association)".

Miklos Lente develops the following calendar reforms:
- The 13 month calendar from www.calendarreform.org
- The 12 month calendar I from www.calendarreform.org
- The 12 month calendar II from www.calendarreform.org
- The 12 month calendar III from www.calendarreform.org

Molly E. Kalkstein is a president of the "IWCA (International World Calendar Association)".

Aristed Canlas Fernando publishes the Aristean perpetual calendar.