Lucerne's carnival date is based on the centuries-old "Catholic" carnival. In AD 325, the First Council of Nicaea decreed that Easter should occur on the first Sunday following the beginning of spring. The previous Sunday is Palm Sunday. Forty (fasting) days before that, Ash Wednesday marks the start of Lent. The days leading up to Ash Wednesday are when Carnival takes place: According to Cantonal law these are Dirty Thursday, Fat Monday and Tuesday
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