The Hebrew Calendar
by Dr. Irv Bromberg, University of Toronto, Canada
[Click here to go back to the Symmetry454 / Kalendis home page]
Menu (click on desired choice):
- Counting the Omer for Hebrew year 5780 (Gregorian 2020) 68KB
- The Kalendis Calendar and Zmanim Calculator
( Free ) Version 11.156(1677) released Dec 5, 2019
- Hebrew Prayer for Maintenance of Good Health with English and French translations 399KB
- Weekly Torah Portions and Special Sabbaths
- The Lengths of the Seasons
- The Duration of Twilight
- Rambam and the Seasons
- The Seasonal Drift of the Hebrew Calendar (correlation with solar cycle, long-term drift)
- Request for Rain (Sh'ela) and Blessing the Sun (Birchat haChamah)
- Why Divide Hours into 1080 Parts?
- Ancient Hebrew hourly mazalot (symbolic names) and weekday names 100KB
- Exact Hebrew Calendar Full Cycle Weekday Frequencies
- The Length of the Lunar Cycle
- Moon and the Molad
- Correlation with lunar cycle, reference meridian, long-term drift
- Novel fixed arithmetic cycle of "yerm eras" exactly equivalent to the traditional molad cycle
- The Rosh Hashanah Postponements
- The Rectified Hebrew Calendar (353-year leap cycle, progressive molad)
- Fixed month lengths, obeys all weekday and day counting rules of the traditional Hebrew calendar.
- Applies the traditional Rosh HaShanah postponement rules to progressively shorter molad intervals.
- An Astronomical Hebrew Calendar
- The Hebrew Calendar "Y6K"
- Links to Geographic Name Servers (for User-Defined Locales in Kalendis)
- What's new at this web site?
I would like to thank my teacher and friend, Rabbi Moshe Ginz, who helped this project progress by encouraging and by spending many hours reviewing the classical sources with me.