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Secular holiday : Cesar Chavez Day - labor leader Cesar Chavez (1927-1993) founded the National Farm Workers Association in 1962.

Catholic or protestant : In the year 325, the Council of Nicée determined a date fo Easter. Full Moon would fall the 14th day of a moon month (1). Easter would be marked by the dominical letter(2)and the epactus(3). With the establishment of the equinox ne variatur on March 21, algorithms where elaborated to attribuate a date for Easter whatever the year.
Time between two consecutive new moons: 20 days 12 hours 44 minutes 2.8 - Gives a letter code for the year's calendar Age of the moon on January 1st, minus one unity, 0 being the new moon's age.

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Catholic or protestant : Easter Monday

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Muslim, Sufi : End of Ramadan (may be changed to the nearest day)

Secular holiday : Solar eclipse

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cards/flowers : The month of Ramadan is that in which was revealed the Quran; a guidance for mankind, and clear proofs of the guidance, and the criterion (of right and wrong). And whosoever of you is present, let him fast the month, and whosoever of you is sick or on a journey, a number of other days. Allah desires for you ease; He desires not hardship for you; and that you should complete the period, and that you should magnify Allah for having guided you, and that perhaps you may be thankful [Wikipedia]

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School holidays : Last day of school if no days are lost due to cancellations, early release for students

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Secular holiday : Commemorates the Battles of Concord and Lexington during the American Revolutionary War.

Special Events : On this day, every individual has to pay his/her income tax to the federal government.

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Secular holiday : Celebrates the Emancipation Act Final Report of the Commission for the Emancipation of Slaves on April 16, 1862.

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Secular holiday : San Jacinto Day: Commemorates the anniversary of the Battle of San Jacinto (1836), which allowed Texas to access to independence. General Sam Houston, commander in chief of the Texan Army, had camped out by the San Jacinto River, waiting for his chance to attack General Santa Anna. General Santa Anna was taken prisoner and forced to sign a treaty.

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Secular holiday : Arbor Day

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Secular holiday : Confederate Memorial Day - commemorates the surrender of Confederate General Joseph E. Johnston to Union General William Sherman on April 26, 1865

cards/flowers : Deliverance of the Jewish people from Egypt. The Seder service on the first two evenings recounts the story of the Exodus

cards/flowers : As the story goes, in 1564, France was one of the first nations to make January 1 officially New Year's Day, instead of the last week of March which was previously observed. In 1582, the Pope followed suit. Those who went on celebrating April 1st were mocked. As the zodiacal sign was the fish, The French placed dead fish on the backs of one another. Traditions vary from country to country.

cards/flowers : Anniversary of the discovery of Florida in 1513 by Juan Ponce de León, who was looking for gold and the Fountain of Youth. He probably named the land Pascua Florida because the date was near Easter ( Pascua in Spanish) Florida

Secular holiday : In tribute to Thomas Jefferson, the third president of the United States (1743-1826). He attended The College of William & Mary and then became a prominent farmer. At 26, he commenced his forty-year career as a politician. He wrote the The Declaration of Independence.

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Secular holiday : Armenian Genocide Remembrance Day (in Turkiye)

School holidays : Armenian Genocide Remembrance Day (in Turkiye)

Special Events : In tribute to Ontarians whose lives have been changed by a workplace incident