"Michaelmas" is pronounced "MICKel-mus." -- Sept 30 is one of the 4 English Quarter Days
Today is also one of the 4 English "Quarter Days," days which fall around the Equinoxes or Solstices and mark the beginnings of new natural seasons ( i.e., Spring, Summer, Winter, Fall) and which were used in medieval times to mark "quarters" for legal purposes, such as settling debts. Debt collection was forbidden certain times of the year such as during the Octave of Christmas.
The other days like this are: Lady Day (the Feast of the Annunciation) on March 25, the Feast of St. John on June 24, and Christmas on December 25.
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