Metonic


Also found in: Encyclopedia, Wikipedia.

Me`ton´ic


a.1.Pertaining to, or discovered by, Meton, the Athenian.
Metonic year
(Astron.) See under Cycle.
References in periodicals archive ?
According to Loewinger, based on his study of the fixed Hebrew calendar, the 8th year in the 19-year Metonic cycle should not be intercalated, as it is unnecessary.
In the late 300s, Theophilus published a century-long list of accurate Easter dates based on the 19-year-long Metonic cycle; in the early 400s, Cyrillus published a 110-year-long list.
The term 'Metonic Cycle' is properly applied to the cycle of nineteen twelve-months reinforced by seven intercalary months.
This points to the Metonic cycle, the well-known period of 19 years after which the lunar phases repeat on (nearly) the same dates of the year.
This relation is that, to six places of decimals, the number of days in 19 tropical years is equal to the number of days in 235 lunar cycles and is known as the metonic cycle.
Because of the roughly 11 day difference between twelve lunar months and one solar year, the calendar repeats in a Metonic 19-year cycle of 235 lunar months, with an extra lunar month added once every two or three years, for a total of seven times every nineteen years.
The 19-year cycle, the so-called "Metonic Cycle", was chosen because 235 lunations occur almost exactly in 19 mean solar years, and this is in step with the Julian calendar (Greulich 1979).
Another may be to question why the Mishnaic calendar was observationally based, while the Babylonian calendar it supposedly derived from had already evolved into a calculated calendar based on the 19-year Metonic cycle since the fifth century B.C.E.
`In effect, Claudio is saying that a whole age has passed without the enforcement of the law; he is implying the ridiculousness of reawakening a law so long dormant.'(6) Nineteen is not an arbitrary number; rather it may be a reference to the Metonic cycle or period, which is defined by OED as `the cycle of 19 Julian years ...
This September 27th, one Metonic cycle later, a very similar total lunar eclipse will be widely seen during the evening throughout the Americas.
The present study does not seek to address the extended lifespan of several figures in the antediluvian generations, for which there are already at least two competing explanations, one based on the "Metonic Cycle" and one based on the "sexagesimal system augmented by seven." (1) Likewise, this study does not consider why or when this particular system ended and another began.
We find that the number 19 is connected to the "Metonic Cycle," a period of 19 solar years, corresponding almost exactly to 235 lunar cycles or 12 years of 12 lunar cycles and 7 years of 13 lunar cycles.