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
Adam trudged past the gates of Eden, his head low, his heart heavy with the pain of remorse.
Suddenly he stopped. A thought had struck him.
He turned to the heavens and exclaimed, “You had this planned! You put that fruit there knowing I would choose to eat from it!”
“But tell me: Why?
The heavens were silent.
But we have found an answer.
Without failure, we can never truly reach into the depths of our souls. We cannot know that our choices matter, and that we hold our destiny in our hands. That we exist.
With that failure and that discovery, we can return to the garden, reaching higher and higher without end, to the One that exists without cause.
Beyond Eden.