בס"ד

Far side of MoonThe Hebrew Calendar

by Dr. Irv Bromberg, University of Toronto, Canada email icon

[Click here to go back to the Symmetry454 / Kalendis home page]

Image at right shows the far side of Moon:
Click on image to see a 150-second near side time-lapse movie of 13 lunar cycles.

Click here to see a 24-second lunar full rotation movie with text explanation, as seen from the Lunar Reconnaissance Orbiter (LRO).

Menu (click on desired choice):

  1. The Kalendis Calendar / Zmanim Calculator
    ( Free ) Version 11.153(1674) released Aug 23, 2019
  2. Hebrew Prayer for Maintenance of Good Health with English and French translations 399KB
  3. Weekly Torah Portions and Special Sabbaths
  4. The Lengths of the Seasons
  5. The Duration of Twilight
  6. Rambam and the Seasons
  7. The Seasonal Drift of the Hebrew Calendar (correlation with solar cycle, long-term drift)
  8. Request for Rain (Sh'ela) and Blessing the Sun (Birchat haChamah)
  9. Why Divide Hours into 1080 Parts?
  10. Ancient Hebrew hourly mazalot (symbolic names) and weekday names 100KB
  11. Exact Hebrew Calendar Full Cycle Weekday Frequencies
  12. The Length of the Lunar Cycle
  13. 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
  14. The Rosh Hashanah Postponements
  15. 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.
  16. An Astronomical Hebrew Calendar
  17. Links to Geographic Name Servers (for User-Defined Locales in Kalendis)
  18. What's new at this web site?

Acknowledgement

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.

CALNDR-L This page updated 22 Av 5779 (Traditional) = 22 Av 5779 (Rectified) = Aug 26, 2019 (Symmetry454) = Aug 24, 2019 (Symmetry010) = Aug 23, 2019 (Gregorian)