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Chapter 7. Working with Times and Dates > Determining the Date of Easter

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7.4. Determining the Date of Easter

Traditionally this holiday is one of the most difficult to compute because it is tied to the lunar cycle. The lunar month does not go evenly into the solar year, and thus anything based on the moon can be expected to vary from year to year.

The algorithm we present here is a well-known one that has made the rounds. We have seen it coded in BASIC, Pascal, and C. We now present it to you in Ruby:


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