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6

The Rambam here is giving an easy way to calculate the moment of conjunction for future months. A (lunar synodic) month, as you stated, is 29 days 12 hours and 793/1080 hours. Since 28 days is exactly 4 weeks (bringing us back to the same point in the week), the next conjunction will occur 1 day 12 hours and 793/1080 hours later in the week relative to the ...


4

Rabbi Yonosan Eibseshitz address this question in Yaaros Dvash (Chelek 2 Drush 4). As far as I can understand, the simple explanation why a mistaken sanctification by Beis Din was not binding in this case is because (as the Gemora in Rosh Hashana 20a explains) this is not applicable in a case of "מיחזי כשיקרא"; if it appears incorrect to the masses Beis Din ...


2

The רמב"ם in הלכות קידוש החודש פרק ו says in הלכה ח: והמולד הראשון שממנו תתחיל, הוא מולד שהיה בשנה ראשונה של יצירה, והוא היה בליל שני חמש שעות בלילה ומאתיים וארבעה חלקים, סימן להם ב' ה' ר"ד; וממנו היא התחלת החשבון. So Molad Tohu was on Sunday night, 2 Tishrie year 0001, 5 hours and 204 parts after sunset, i.e. 23:11 PM and 33⅓ seconds, according ...



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