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Calendrical Calculations Edward M. Reingold, Nachum Dershowitz
Publisher: Cambridge University Press

Lightning Calculation Calendar I have researched and written about methods of mental calculation over the years, and I'm often surprised at the ingenuity evident in the mathematical methods developed specifically for it. This procedure was replaced in the 4th century by detailed Calendrical calculations worked out by Hillel II. Myagmarsuren, was recently judged the world's best Calendar Calculator, taking first place in the Mental Calculation World Cup 2012 in Giessen, Germany. Download Nachum Dershowitz and Edward M. I always end up learning something in the process. And launch window analysis) for lunar spacecraft missions as well as serving as the basis for the Hebrew calendar's 19 year cycle.” Nothing like bringing together the ancient and the modern through calendrical calculations. A similar article appears in the Tzav/Pesach 2013 edition of Yated Ne'eman in the Calendar Calculations Column by Rabbi Dovid Heber. Reingold, "Calendrical Calculations". Because I find calendrical calculations interesting, I write posts debunking these odd ideas when I run across them. Nachum Dershowitz and Edward M. The above has been re-printed with permission of Yated Ne'eman. The old practice, in much altered form, was revived in the Middle Ages when the Rosh Chodesh blessing was introduced.