Meton of Athens was a mathematician, astronomer and engineer who lived in Athens in the 5th century BCE. He is best known for the 19-year Metonic Cycle which he introduced into the Athenian luni-solar calendar as a method of calculating dates. It was his observation that a period of 19 solar years (6,940 days) is almost exactly 235 synodic or lunar months, with an error of only 2 hours. This cycle can be used to predict eclipses, forms the basis of the Greek and Jewish calendars, and is used to determine the date for Easter each year. The Acropolis in central Athens, one of the most important landmarks in world history. ... BCE is a TLA that may stand for: European Central Bank in some Romance languages (e. ... The Metonic cycle or Enneadecaeteris in astronomy and calendar studies is a particular approximate common multiple of the tropical year and the synodic month. ... The Attic calendar is the name of the calendar used in Ancient Athens. ... A tropical year is the length of time that the Sun, as viewed from the Earth, takes to return to the same position along the ecliptic (its path among the stars on the celestial sphere). ... In Egyptian mythology, Month is an alternate spelling for Menthu. ... This should perhaps be merged with Month. ... This article discusses astronomical eclipses. ... The Attic calendar is the name of the calendar used in Ancient Athens. ... This figure, in a detail of a medieval Hebrew calendar, reminded Jews of the palm branches ( Lulav) and the citron ( Etrog) to be brought to the synagogue at the end of sukkot, closing the solemn convocations of the calendar in autumn. ... Easter (also called Pascha) is generally accounted the most important holiday of the Christian year, observed March or April each year to celebrate the Resurrection of Jesus from the dead (after his death by crucifixion; see Good Friday), which Christians believe happened at about this time of year, almost two...

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Meton of Athens (http://www.tmth.edu.gr/en/aet/5/69.html)