Lunisolar cycle

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A lunisolar cycle ( lat. Luna "moon" and sol "sun") is literally any resulting cycle that arises from the superposition of the apparent orbital times of the sun and moon around the earth.

In a narrower sense, only the 19-year lunisolar cycle is meant, which is also called the Meton cycle . It is based on the fact that 19 solar years are roughly the same length as 235 synodic lunar months, which is used when setting up lunisolar calendars .

The error between 19 years (19 × 365.24219 days = 6,939.60161 days) and 235 synodic months (235 × 29.530589 days = 6,939.68842 days) is 0.086805 days or 1 day in about 219 years (or 1 Day in about 11½ meton periods).

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