AI Summary
5 min readIn 1980, Rabbi Ali Scharf was a young man sitting nervously in the home of his future father-in-law, trying to make a good impression. His soon-to-be father-in-law asked a seemingly simple question: "Today is December 5th. Why do we start saying V'tein Tal U'matar around December 5th?" Rabbi Scharf knew the Gemara specifies a date for this prayer for rain, but he didn't know why it corresponded to a secular calendar date. He admitted he didn't know and promised to get back to him. When he researched it, he discovered that December 5th has nothing to do with the Gemara. The correct date should be November 22nd. The discrepancy of thirteen days is the accumulated error of the Jewish calendar's solar calculations — an inaccuracy that has never been corrected the way the Julian calendar was corrected by the Gregorian calendar. That moment of embarrassment and curiosity launched a decades-long project that eventually became his new book, A Simplified Study of the Jewish Calendar.
The Core Problem: Reconciling the Moon and the Sun
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What you'll learn
- 1 (00:11) **Book Introduction and Origin Story** - R' Ali Scharf introduces his new book on the Jewish calendar and explains the personal story that inspired him to write it.
- 2 (03:29) **From Hand-Typed Notes to Published Book** - The author recounts the 40-year journey of the manuscript, from handwritten notes to a modern, polished book.
- 3 (06:11) **Chapter Overview and the Lunisolar Calendar** - The host and author outline the book's chapters and dive into the foundational concept of the lunisolar calendar.
- 4 (09:04) **The Muslim Calendar as a Counter-Example** - The author uses the Islamic calendar to illustrate what would happen to Jewish holidays without a leap year.
- 5 (10:27) **From the Sanhedrin to Hillel's Fixed Calendar** - The discussion moves from the historical, observation-based calendar to the modern, mathematically fixed one.
- 6 (12:42) **Demystifying the Molad** - The author clarifies what the Molad is and how it serves as the foundation for all calendar calculations.
- 7 (14:31) **The Dehiyot (Postponements) of Rosh Hashanah** - This section explains why Rosh Hashanah doesn't always fall on the day of the Molad of Tishrei.
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Show Notes
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