Easter-day (on which the rest depend) 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.
Advent Sunday is always the nearest Sunday to the Feast of St
Andrew, whether before or after.
Septuagesima | | nine |
Sexagesima \ Sunday is / eight \ weeks before Easter.
Quinquagesima / \ seven /
Quadragesima | | six |
Rogation Sunday | | five weeks |
Ascension-day \ is / forty days \ after Easter.
Whitsunday / \ seven weeks /
Trinity Sunday | | eight weeks |