Calculating Leap Years

An entirely new methodology is proposed for computing leap years in the New Coptic Calendar. The intent is to maintain synchronization with the Gregorian Calendar in perpetuity.

The new method is as follows:

  1. Let Y be the year in the New Coptic Calendar.

  2. Y'= Y + 284

  3. If Y' mod 400 =0, Y is a leap year.

  4. Else if Y' mod 100 = 0, Y is not a leap year.

  5. Else if Y' mod 4 = 0, Y is a leap year.

  6. Else Y is not a leap year.

 

Stated more simply, take the Coptic year and add 284 to it. If the corresponding year in the Gregorian Calendar is a leap year, then that Coptic year is a leap year as well.

For example, consider the the year 1736 AM. It is not a leap year in the Old Coptic Calendar.

But following the proposed leap year calculation for the New Coptic Calendar, 1736 + 284 = 2020. The year 2020 is a leap year in the Gregorian calendar. Therefore, 1736 is also a leap year in the New Coptic Calendar.

This means that an additional epagomenal day is inserted at the end of the year 1736 in the New Coptic Calendar, which results in the Little Month (Pikouji enAvot) having 6 days instead of 5.