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.
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The menstrual cycle begins Day 1 of your period, about half way through the cycle you ovulate and the last day is the day before your next period starts. Day 1 begins the cycle all over again. The last day of your cycle tells you the length of your cycle, on average between 24 and 34 days, although longer and shorter cycles are still "normal".
It marks the completion of a yearly cycle of reading the Torah, and the privilege of beginning to read it again.
Gap 1 Phase
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 last festival day at the end of Sukkoth, it marks the end and beginning of the year's Torah-reading cycle.
Gastrulation marks the beginning of germ layer development in an embryo.
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It marks the beginning of the DNA chain
The December solstice, which is the winter solstice in the northern hemisphere marks the beginning of northern winter.
The fall of classicism, Huns, and Byaztine marks the beginning of the ppost classical period
the Kamakura bakufu