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In the Northern Hemisphere it is the winter solstice that marks the start of winter.
An asteroid impact
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The calendar is intended to mark the number of years since the death of King Herod the Great. The Roman abbot Dionysus Exiguus devised the new Christian calendar in 533. He knew that it was impossible to say when Jesus was born, but he knew, or thought he knew, when Herod died. So, he chose to begin his Christian calendar on the year of Herod's death, and he based this on the reign of the Roman emperor Augustus. Unaware that Augustus only adopted that name four years after his reign began, going by his birth name of Octavius until then, Exiguus commenced his calendar just 4 years too late.
The Storming of Bastille
Black Tuesday
the mass extiction
flying dildos
Invasion of Poland
nun of yo dambuise wack's
Pearl Harbor bombing
bombing in pearl harbor
The menstrual cycle is the natural changes of the uterus and ovaries in the part of making sexual reproduction possible. The average length of each cycle is 28 days, divided into 2 parts (ovarian cycle and uterine cycle), each with 3 phases. The beginning of menstrual flow, or period, marks the end of one menstrual cycle and start of a new one.
It marks the completion of a yearly cycle of reading the Torah, and the privilege of beginning to read it again.