Metonic cycle

Author: janesix ,

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Does anyone know the exact number of years, or the exact number of lunations in the metonic cycle?
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According to Google, 19 years, or 235 lunar months.
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Thank, that's as close as I'm getting. Websites say "nearly" or "close to" 19 years, I am looking for the exact number of years. 
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How more exact than 19 years can one get.

It is either 18, 19, or 20. 

Though if it were18, why would one say that it was 19?