The date for Easter in U.S.A. is Sunday, April 20, 2014, which coincides with the Eastern Orthodox Churches that include Russian, and Greek Orthodox denominations that dominate across Europe.
In the West, Christians follow the Gregorian calendar which includes Roman Catholic, Anglican communion, Protestant Churches and other denominations. Eastern Orthodox Christians follow the Julian calendar.
In the west, Easter is celebrated on the Sunday following the Paschal Full Moon.
According to the Merriam Webster encyclopedia, the Paschal Full Moon was introduced in 1892. It falls on the 14th day of a lunar month occurring on or next after March 21 calculated by a fixed set of ecclesiastical calendar rules, without regard to the real moon.
The calculation for the Orthodox Easter is the same, except it’s based on the much older Julian calendar which has its own conventions of calculating equinoxes, the two dates in the year when day and night are of equal length.
In 2015, Western Christianity will celebrate Easter on Sunday, April 5. In the Eastern Orthodox Christianity Easter Sunday will fall on Sunday April 12.
*Easter Bunny image from Shutterstock.com.