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Adar I & II

S. Essig 2 years ago • updated by Michael J. Radwin 2 years ago • 1

Having a problem with a yahrzeit falling on Adar II that doesn't seem to occur on Adar II - the death occurred on 2/20/88. Hebcal shows 2 Adar 5748 when converting to "Hebrew" (& gives me 3/5 this year with Adar II when I convert to "Gregorian" in 5782).

Answer

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Completed
Michael J. Radwin 2 years ago

Hi, thanks for using the Hebcal Yahrzeit + Anniversary calendar.

Hebcal uses the yahrzeit algorithm defined in Calendrical Calculations by Edward M. Reingold and Nachum Dershowitz.

The customary anniversary date of a death is more complicated and depends also on the character of the year in which the first anniversary occurs. There are several cases:

  • If the date of death is Marcheshvan 30, the anniversary in general depends on the first anniversary; if that first anniversary was not Marcheshvan 30, use the day before Kislev 1.
  • If the date of death is Kislev 30, the anniversary in general again depends on the first anniversary — if that was not Kislev 30, use the day before Tevet 1.
  • If the date of death is Adar II, the anniversary is the same day in the last month of the Hebrew year (Adar or Adar II).
  • If the date of death is Adar I 30, the anniversary in a Hebrew year that is not a leap year (in which Adar only has 29 days) is the last day in Shevat.
  • In all other cases, use the normal (that is, same month number) anniversary of the date of death.

[Calendrical Calculations p. 113]


Now, using the date you mentioned above:

Sat, 20 February 1988 = 2nd of Adar, 5748   ב׳ בַּאֲדָר תשמ״ח

Since 5748 was not a leap year, there was only one Adar that year. This means that the death occurred in 12th month of the Hebrew year.


Suppose one wishes to observe the yahrzeit in Hebrew year 5782. Since 5782 is a leap year and none of the other rules applies, we use the same month number as the date of death. In a leap year the 12th month is Adar I, so the yahrzeit is observed on 2nd of Adar I, 5782 (Thu, 3 Feb 2022).

More information here:

https://www.hebcal.com/home/54/anniversaries-adar-cheshvan-kislev

Answer
Completed
Michael J. Radwin 2 years ago

Hi, thanks for using the Hebcal Yahrzeit + Anniversary calendar.

Hebcal uses the yahrzeit algorithm defined in Calendrical Calculations by Edward M. Reingold and Nachum Dershowitz.

The customary anniversary date of a death is more complicated and depends also on the character of the year in which the first anniversary occurs. There are several cases:

  • If the date of death is Marcheshvan 30, the anniversary in general depends on the first anniversary; if that first anniversary was not Marcheshvan 30, use the day before Kislev 1.
  • If the date of death is Kislev 30, the anniversary in general again depends on the first anniversary — if that was not Kislev 30, use the day before Tevet 1.
  • If the date of death is Adar II, the anniversary is the same day in the last month of the Hebrew year (Adar or Adar II).
  • If the date of death is Adar I 30, the anniversary in a Hebrew year that is not a leap year (in which Adar only has 29 days) is the last day in Shevat.
  • In all other cases, use the normal (that is, same month number) anniversary of the date of death.

[Calendrical Calculations p. 113]


Now, using the date you mentioned above:

Sat, 20 February 1988 = 2nd of Adar, 5748   ב׳ בַּאֲדָר תשמ״ח

Since 5748 was not a leap year, there was only one Adar that year. This means that the death occurred in 12th month of the Hebrew year.


Suppose one wishes to observe the yahrzeit in Hebrew year 5782. Since 5782 is a leap year and none of the other rules applies, we use the same month number as the date of death. In a leap year the 12th month is Adar I, so the yahrzeit is observed on 2nd of Adar I, 5782 (Thu, 3 Feb 2022).

More information here:

https://www.hebcal.com/home/54/anniversaries-adar-cheshvan-kislev

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