The Full Moon that Determines Easter

Commander Chris Hadfield tweeted this photo from the International Space Station on March 31, 2013. Have you ever wondered how the date of Easter is actually set? The day to be observed as Easter was fixed by a great council of Christian churches, called the First Council of Nicaea, which met at Nicaea (now İznik, in the province of Bursa, Turkey) in A.D. 325.