Gregorian Calendar With Easter Sunday
Calculating the calendar of a previous year (for the Gregorian calendar taking account of the week) is a relatively easy matter when Easter Sunday is not included on the calendar. However, calculating for Easter Sunday is difficult because the calculation depends on the full moon cycle. Easter Sunday represents the first Sunday after the first full moon after the Vernal Equinox according to the computus. But it is defined as the Sunday following a theoretical Full Moon date falling on or after March 21, and different (though equivalent) calculations are specified by the Papal Bull of 1582 and the British Calendar Act of 1751. So, this makes an additional calculation necessary on top of the normal calculation for January 1 and the calculation of whether or not the year is a leap year.
There are only 14 different calendars when Easter Sunday is not involved. Each calendar is determined by the day of the week January 1 falls on and whether or not the year is a leap year. However, when Easter Sunday is included, there are 70 different calendars (two for each date of Easter).
Read more about this topic: Calendar
Famous quotes containing the words calendar, easter and/or sunday:
“To divide one’s life by years is of course to tumble into a trap set by our own arithmetic. The calendar consents to carry on its dull wall-existence by the arbitrary timetables we have drawn up in consultation with those permanent commuters, Earth and Sun. But we, unlike trees, need grow no annual rings.”
—Clifton Fadiman (b. 1904)
“In your Easter bonnet, with all the frills upon it,
You’ll be the grandest lady in the Easter parade.”
—Irving Berlin (1888–1989)
“History is made in the class struggle and not in bed.”
—Alex Mitchell, British left-wing journalist. quoted in Sunday Times (London, 29 Dec. 1985)