In order to better understand the patterns in the Metonic sequence, and the placement of Blue Moons and Leap Months it was felt that a diagram would help.

This tool allows you to enter a start year, and generate a diagram for any given number of years beyond that. Keep in mind that the calculations do have a very small margin of error, and that calculating dates many hundreds of years into the future will not be 100% accurate. But this is based on the best available data.

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