the Maya calendar ends (December 21, 2012)


the Y2K bug (1999-2000) turned out not to have occurred on most computers


Swatch Internet Time (1998)


The Long Now Foundation (1996)


Stephen Hawking's Brief History of Time (1988)



Back to the Future (1985)


Unix time (1971)


Temporal logic (1960s)



digital clocks (1956)


the atomic clock (1955)



La persistencia de la memoria (1931)


most major countries adopted hourly time zones by (1929)


Georges Lemaître (1927) derived the Friedmann-Lemaître-Robertson-Walker equations

from Albert Einstein's equations of general relativity and proposed, that the Universe

began with the "explosion" of a "primeval atom" - what was later called the Big Bang



Daylight saving time (1916)


John McTaggart's A-series and B-series (1908)


Spacetime (1905)



the first time clock was invented (November 20, 1888) by Willard Bundy, a jeweler in Auburn, New York


Nietzsche resurrected the thought of eternal recurrence (1882)


Hippolyte Fizeau (1850) measured the speed of light and electricity



the French Revolutionary Calendar (October 24, 1793)

was adopted by the Jacobin-controlled National Convention


the Critique of Pure Reason (1781)



the Harrison H4 (1761)



the chronometer (1730)


Ole Rømer made the first quantitative measurements of the speed of light (1676)


Greenwich Mean Time (1675)



the pendulum clock (1656) was patented to Christiaan Huygens


Archbishop Ussher estimated by reading the Bible (1650) that

the earth was created on October 23, 4004 BC at 9:00am



Venice (1522) adopted the Gregorian calendar. Other countries following suit were:

Germany (1544) Spain, Portugal, Netherlands (1556), Prussia Denmark, Sweden (1559),

France (1564), Scotland (1600) Russia (1721) and England (1752). The calendar was

decreed by Pope Gregory XIII, for whom it was named, on February 24, 1582


the Alfonsine tables (1252)


the Muslim calendar (July 16, 622)



Dionysius Exiguus (525) recorded in his Easter Tables Jesus of Nazareth's birthday as December 25, 753

years after Rome was founded. The error, an incorrect year and date, was repeated in all Christian calendars


computus (154)


Liu Xin's Triple Concordance (8)


the four year - leap year cycle (8 bc)


the roman month Sextilis was renamed (8 bc) in honor of Augustus


the Julian calendar was introduced by Caesar in 46 bc, taking force in 45 bc


the seven-day week


the Roman calendar


the Hellenic calendars


in Egypt, sundials (1500 bc) which divide t time from

sunrise to sunset into 12 equal periods, are used to tell time



solar alignments of ritual sites (3200 bc)


beginning of the epoch of the Hebrew calendar (October 7, 3761 bc)


Egyptians (4236 bc) introduced the first solar calendar


water clocks


star clocks