Category Archives: Observance
Correction: Ta’anit Bechorot falls on Friday April 6, 2012
Ta’anit Bechorot (Fast of the Firstborn) falls on Friday, April 6, 2012. An earlier version of the calendar we publish incorrectly had this minor fast on Thursday. When this fast day falls on Friday, we do in fact observe the fast on … Continue reading
What is Havdalah (or, When does Shabbat end)?
Shabbat ends after sundown on Saturday night when there are three stars visible. Depending on latitude and longitude, this is usually between 42 and 72 minutes after sundown.
How does Hebcal determine anniversaries in Adar, Cheshvan, or Kislev?
Hebcal uses the algorithm defined in Calendrical Calculations by Edward M. Reingold and Nachum Dershowitz. Birthday Reingold and Dershowitz write: The birthday of someone born in Adar of an ordinary year or Adar II of a leap year is also … Continue reading
When do the Holidays begin?
All Jewish Holidays begin the evening before the date specified. This is because the Jewish day actually begins at sundown on the previous night. Sometimes, for clarity, the Erev Holiday is also included.
What does CH”M mean?
CH”M is an abbreviation for Chol Ha-Mo’ed. Chol Ha-Mo’ed are the intermediate days of Passover and Sukkot, when work is permitted.
Why are fixed fast days sometimes observed on a different day?
For example, Tzom Tammuz is always on the 17th of Tammuz, but in the year 5772 (2012 C.E.) it is on the 18th of Tammuz. The answer has to do with Shabbat: “The Hebrew year contains several fast days that, … Continue reading