| Adelaide Festival of the Arts - Friday February 26, 2021 Culture : Www.adelaidefestival.com.au lasts 2 weeks - 2020 edition confirmed
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| Adelaide Cup Day - Monday March 8, 2021 Secular holiday :
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| Good Friday - Friday April 2, 2021 Catholic or protestant : The First Council of Nicaea (a gathering of bishops in the early days of Christianity) wanted to find a day to commemorate the crucifixion and resurrection of Christ.
This commemoration had to be linked to Jewish holiday traditions, since the last supper of Christ was believed to be a Jewish Passover meal. But the Jewish calendar is based on lunar and solar cycles, so the Easter celebration had to follow the same calendar.
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| Adelaide Film Festival - Friday April 2, 2021 Culture : Lasts one week - www.adelaidefilmfestival.org in Adelaide 2020 edition NOT confirmed
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| Holy Saturday - Saturday April 3, 2021 Catholic or protestant : paid holiday
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| Daylight Saving Time - Sunday April 4, 2021 Special Events : Used to be last Sunday of March until 2007.
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| Easter Monday - Monday April 5, 2021 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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| Easter holiday (beginning) - Friday April 9, 2021 School holidays :
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| Anzac Day - Sunday April 25, 2021 Secular holiday : ANZAC(Australia and New Zealand Army Corps)Day commemorates those soldiers who died during world wars (from the Boer war to the Vietnam war), and particuarly remembers those who died during the Gallipoli campaign during WW1(Turkey).
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| Anzac Day - Monday April 26, 2021 Secular holiday : ANZAC(Australia and New Zealand Army Corps)Day commemorates those soldiers who died during world
wars (from the Boer war to the Vietnam war), and particuarly remembers those who died during the Gallipoli campaign during WW1(Turkey).
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| Easter holiday (end) - Tuesday April 27, 2021 School holidays :
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