While a day like Christmas is fixed in our minds and on the calendars on December 25th, many of the important feasts of the Church year move, based upon the date that Easter is set. Easter changes each year moving to the Sunday after the "Paschal Full Moon," and can fall between March 22 and April 25.

In ancient times before calendars were common, most people did not know the dates for the upcoming Liturgical year. On Epiphany Sunday, the upcoming dates were "proclaimed" after the gospel in this way: