Metonic Cycle
From LoveToKnow 1911
METONIC CYCLE, in chronology, a period of 19 years during which there are 235 lunations, so called because discovered by Meton. Computation from modern data shows that 235 lunations are 6939 days, 16.
Metonic cycle
The Metonic cycle or Enneadecaeteris in astronomy and calendar studies is a particular approximate common multiple of the year (specifically, the seasonal i.e. tropical year) and the synodic month.
Metonic Cycle
Related Category: Astronomy: General
see synodic period.
More on Metonic Cycle
Synodic Period - in astronomy, length of time during which a body in the solar system makes one orbit of the sun relative to the earth, i.e.
Metonic Cycle
of Athens (ca. 440 BC) noticed that 235 lunar months made up almost exactly 19 solar years. Using modern measurements, ...
metonic cycle: a cycle of 19 years (or 235 lunar months) over which the phases of the moon occur on the same month and day. It was discovered by the Greek astronomer Meton c.433 BC and determines the epact number and the Golden Number.
Metonic cycle. The period of 6 939.6 days, or 19 calendar years, after which the Moon's phases recur on the same day of the year. This period is also equal to 253 lunations.
The Metonic Cycle and the Saros
The Greek astronomer Metos, in the fifth century BC, discovered that the dates of the phases of the Moon repeated exactly after a period of 19 years.
The Metonic cycle does not have an integer number of days, but it was adapted to a mean year of 365.25 days by means of the 4×19 year Callipic cycle.
The Metonic cycle (432 BC) assigned 6,940 days to these 19 years producing an average year of 365+1/4+1/76 or 365.26316 days. The Callippic cycle (330 BC) dropped one day from four Metonic cycles (76 years) for an average year of 365+1/4 or 365.
Metonic cycle (NASA SP-7, 1965) A period of 19 years, after which the various phases of the moon fall on approximately the same days of the year as in the previous cycle.
The solution to this lies with the Metonic cycle, which lasts 19 years. It is the time it takes the full moon that falls on a certain day of the year to fall on the same day of the year. The Metonic cycle is 6939.6 days, which is 235.
Earlier Greek astronomers and mathematicians were influenced by Babylonian astronomy to some extent, for instance the period relations of the Metonic cycle and Saros cycle may have come from Babylonian sources.
Callipus improved the Greek calendar, reconciling the lunar month with the solar year, by introducing a unit of time called the Callippic cycle (it was an improvement on the Metonic cycle of 6939.
Today this system is known as the Metonic cycle, because the Greek astronomer Meton introduced it in Athens in the year 432 BCE. However, the Babylonians already knew this at least 400 years earlier.
Astronomical chronology Â- Cosmic Calendar Â- Ephemeris Â- Galactic year Â- Metonic cycle Â- Milankovitch cycles
Geologic time scale
and techniques ...
Interestingly, the Julian day was not named for Julius Caesar, like that calendar was - it was named for Julius Caesar Scaliger, the father of Joseph Scaliger, the French humanist who combined the solar cycle (28 years), Metonic cycle (19 years), ...
(See Metonic Cycle.) In the years 2021 and 2040, the first quarter moon not only falls on Veterans Day but also returns to virtually the same place among the stars - standing, once again, near M 30 in Capricorn.
two Blue Moons in the same year -- like in 1999, when both January and March had a Blue Moon, while February had no Full Moon at all. Since the phases of the Moon usually repeat themselves on the same dates every nineteen years (the Metonic cycle), ...
Metonic cycle
Meudon Observatory
Miaplacidus (Beta Carinae)
Mice, The (NGC 4676 A and B)
microlensing
Microlensing Observations in Astrophysics (MOA)
Microlensing Planet Search (MPS) Project
micrometeorites
microquasar
Microscopium ...
Callipic cycle (NASA SP-7, 1965) Four Metonic cycles or 76 years. Callisto (NASA Thesaurus / NASA SP-7, 1965) A satellite of Jupiter orbiting at a mean distance of 1,884,000 kilometers. Also called Jupiter IV.
 See also: Cycle, Calendar, Month, Solar, Period
|
