The kiddush-hachodesh tag has no wiki summary.
4
votes
1answer
103 views
Rambam's method for calculating the conjunction of the moon (and sun)
I think I'm missing something basic here...
The Rambam, in Hilchot Kiddush Hachodesh (6:3) says that the interval between one conjunction to the next is is 29 full days, 12 hours of the 30th day, and ...
1
vote
1answer
80 views
What was the first Hebrew date of the first Molad?
If one were to represent the Molad Tohu as a date, comprised of a month, day, year, hours, minutes, seconds, and chalakim, what date would that be?
8
votes
1answer
113 views
Why did the 40th-year Jews think they'd erred about Av? Sanhedrin had declared it
Rashi says that
ובשנת ארבעים שנה עשו ולמחר עמדו כולן חיים וכיון שראו כך תמהו ואמרו שמא טעינו בחשבון החדש חזרו ושכבו בקבריהן בלילות עד ליל חמשה עשר וכיון שראו שנתמלאה הלבנה בט"ו ולא מת אחד מהם ...
2
votes
0answers
48 views
If a Beis Din Makes a Mistake When Calculating Kiddush HaChodesh, Does it Count?
On one hand, the Rambam says (in 2:10)
Once the court sanctifies the new month, it remains sanctified regardless of whether they erred unwittingly, they were led astray [by false witnesses], or ...
