Easter related Holidays for the year 2021
The date of Easter Day was defined by the Council of Nicaea in AD325 as the Sunday after the first full moon which falls on or after the Spring Equinox. The Equinox is assumed to always fall on 21st March, so the calculation reduces to determining the date of the full moon and the date of the following Sunday. The algorithm used here was introduced around the year 532 by Dionysius Exiguus. Under the Julian Calendar (for years before 1753) a simple 19-year cycle is used to track the phases of the Moon. Under the Gregorian Calendar (for years after 1753 - devised by Clavius and Lilius, and introduced by Pope Gregory XIII in October 1582, and into Britain and its then colonies in September 1752) two correction factors are added to make the cycle more accurate.
Easter Sunday 
Sun April 04 2021
Septuagesima Sun January 31 2021
Sexagesima Sun February 07 2021
Quinquagesima Sun February 14 2021
Shrove Tuesday (Mardi Gras) Tue February 16 2021
Ash Wednesday Wed February 17 2021
Palm Sunday Sun March 28 2021
Good Friday Fri April 02 2021
Rogation Sunday Sun May 09 2021
Ascension Thu May 13 2021
Pentecost Sun May 23 2021
Trinity Sunday Sun May 30 2021
Corpus Christi Thu June 03 2021
Christmas related Holidays for the year 2021
First Sunday of Advent Sunday November 28 2021
Second Sunday of Advent Sunday December 05 2021
Third Sunday of Advent Sunday December 12 2021
Forth Sunday of Advent Sunday December 19 2021
Christmas Eve Friday December 24 2021
Epiphany Thursday January 06 2022
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