Metonic Cycle

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Metonic Cycle

</dt>
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. </dd>
The Metonic cycle is the basis for the golden numbers used to determine the data of Easter. Four such cycles form a Callippic cycle. [[/a>|/a> ]]

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use