Two calendars, two Easters

When I was growing up we celebrated Easter twice, first western Easter, which is calculated according to the Gregorian calendar, and then "Greek Easter," which is calculated according to the Julian calendar. Greek Easter would see us celebrating with a large meal at my aunt and uncle's home. Usually the two days are a week or two apart. Last year they fell on the same date. This year there are fully five weeks separating the two holidays, as western Easter falls on 27 March and Orthodox Easter on 1 May. Here are two websites, the first listing the two dates for the years 1997 through 2205, and the second listing the dates for Orthodox Easter from 1875 to 2124, in Julian and Gregorian calendars.