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1. How is the timing of Passover calculated? Why does Passover sometimes fall after Easter?
The two special days are based on two different calendars. Easter is based on the solar calendar, the calendar commonly used today. In Western churches, Easter is dated as the first Sunday after the first full moon of spring. It therefore occurs somewhere between March 22 and April 25. Eastern Orthodox churches have a different approach based on the lunar calendar.
Passover, on the other hand, is based on the Jewish calendar, a lunar calendar that has twelve 28-day months. Every two or three years, there is a thirteenth month called Adar II included in the calendar. Over the course of a 19-year cycle, this “extra” month occurs in the 3rd, 6th, 8th, 11th, 14th, 17th, and 19th years. For example, the year 2008 was one of those years with an extra month. Passover occurs from the 15th to the 21st of the month of Nisan – which is the month right after the “extra” month of Adar II. The inclusion of the “extra” month in the lunar calendar thus caused Passover to fall nearly 30 days after Easter in 2008.


