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.
This is known as the Metonic cycle
. So, in other words, the phases of the moon realign (or nearly realign) with the same calendar dates every 19 years." (The right shutter timing may have you catching the silhouette of Santa's sleigh.
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.
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.
However, there is a curious relationship between the number of days in a solar year and those in a lunar cycle as given in #1 and #2, respectively, that nevertheless makes a lunar-solar (or lunisolar) calendar possible; this relationship is known as the Metonic cycle
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.