Shortly before sundown on the 29th of Adar, G-d commanded Moses regarding the mitzvah of sanctifying the crescent new moon and establishing a lunar calendar. This is the first mitzvah the Jews were given as a nation.
Moses had difficulty envisaging the moon's appearance at the exact moment of its monthly rebirth. After the sun set, G-d showed Moses the crescent new moon of the new month of Nissan, showing him the precise dimensions of the moon at the moment the new month is to be consecrated.
For the generations that followed, each new month was ushered in when two witnesses testified before the Sanhedrin (rabbinic supreme court) that they had seen the molad, the new moon. In the 4th century CE, Hillel II foresaw that the Jews would no longer be able to follow a Sanhedrin-based calendar. So Hillel and his rabbinical court established the perpetual calendar which is followed today -- until Moshiach will come and reestablish the Sanhedrin.
Links::
Lunar Time
Rosh Chodesh
The Molad
A few months after its creation, Napoleon's "Sanhedrin" (rabbinical supreme court) was dissolved. The Sanhedrin was created to approve certain religious regulations requested by the French "Assembly of Notables." The regulations were designed to blur the distinction between Jews and non-Jews.
The rulings of this pseudo-Sanhedrin were never adopted by Jewish communities.
Link:: Napoleon Bonoparte
Of the 54 parshiot of the Five Books of Moses, only one is named after a woman. It is called “The Life of Sarah.”
It opens by informing us that Sarah has died.
Yes, this is the life of Sarah. Her true life. Because only in her passing was Sarah’s life fulfilled.
During her lifetime, she and her husband Abraham surveyed the land promised to their children. Only once Sarah died did Abraham make his first actual purchase, publicly and with full payment. Sarah’s burial plot and its accompanying field in Hebron mark the seminal point of the Land of Israel.
During her lifetime, Sarah had only one child, who remained single. From where would come the “offspring more numerous than the stars” that G‑d had promised? With Sarah’s passing, the match between Isaac and Rebecca was made, a woman much like Sarah, through whom the Jewish people would become a reality.
During Sarah’s lifetime, Abraham was not able to guide Ishmael. By divine command, he was compelled to harken to Sarah, who witnessed Ishmael’s corruptive influence and demanded he be sent away. By the end of the parashah, Abraham is following in the ways of Sarah with the rest of his children. Even Ishmael has repented and accepted Isaac as the true heir of Abraham.
It was after Sarah’s passing that Abraham’s vision began to emerge into reality in this world—through the work of Sarah.
This is true life—a life not confined to the years of a physical body, but a life that becomes yet more real after it is released from those confines, and continues to be felt more and more with every year that passes.
Such is the life of a mother. While the rest of us live within a moment that has already disappeared, a mother gives life, nurtures life, and guides that life into eternity.