Easter-day shall, in the calendar year next but one after the commencement of this Act and in all subsequent years, be the first Sunday after the second Saturday in April, and section three of the [24 Geo. 2. c. 23.] Calendar (New Style) Act, 1750, the new calendar, tables and rules annexed to that Act, and section two of the [25 Geo. 2. c. 30.] Calendar Act, 1751, are hereby amended and shall be read and construed accordingly, and, in particular, the Calendar (New Style) Act, 1750, shall, as respects such calendar years as aforesaid, have effect as if in the " Rules to know when the Moveable Feasts and Holy Days begin" contained in that Act, for the words " is always the first Sunday after the full moon which " happens upon or next after the twenty-first day of " March, and if the full moon happens upon a Sunday, " Easter Day is the Sunday after," there shall be substituted the words " is always the first Sunday after the second Saturday in April. "