208 apendix C: Determining the Date of a Yortsayt Determining the Date of a Yortsayt Observe a yortsayt on the anniversary of the date of death, calculated according to the Hebrew calendar. Some dates do not occur every year. For a death on one of these dates, determine the yortsayt using these guidelines: Death occurred on 30 Ḥeshvan ( Rosh Ḥodesh Kislev— Day 1) • If in the next year 30 Ḥeshvan does not occur, then every year: Observe 29 Ḥeshvan. ( Thus, the yortsayt is observed on the same date each year.) • If in the next year 30 Ḥeshvan does occur, then each year: Observe 30 Ḥeshvan in every year it occurs. In other years, observe 1 Kislev. ( Thus, the yortsayt is always observed on Rosh Ḥodesh Kislev, either on Day 1 of Rosh Ḥodesh or on the only day of Rosh Ḥodesh.) Death occurred on 30 Kislev ( Rosh Ḥodesh Tevet— Day 1) • If in the next year 30 Kislev does not occur, then every year: Observe 29 Kislev. ( Thus, the yortsayt is observed on the same date each year.) • If in the next year 30 Kislev does occur, then each year: Observe 30 Kislev in every year it occurs. In other years, observe 1 Tevet. ( Thus, the yortsayt is always observed on Rosh Ḥodesh Tevet, either on Day 1 of Rosh Ḥodesh or on the only day of Rosh Ḥodesh.) Death occurred during Adar ( in a non- leap year) • In a non- leap year, observe the date of death in Adar. • In a leap year, observe the date in 1st Adar. ( Some follow the custom of observing the date in both 1st Adar and 2nd Adar.) Death occurred during 1st Adar or 2nd Adar ( in a leap year) • In a non- leap year, observe the date in Adar. • In a leap year, observe the date in the Adar ( 1st or 2nd) in which the death occurred. Death occurred on 30th of 1st Adar ( Rosh Ḥodesh 2nd Adar— Day 1, in a leap year) • In a non- leap year, observe 30 Shevat ( Rosh Ḥodesh Adar— Day 1). • In a leap year, observe 30th of 1st Adar ( Rosh Ḥodesh 2nd Adar— Day 1).