Yahrzeit, Yiddish for time of year, is the annual commemoration of a death observed on its Hebrew calendar anniversary rather than on the civil calendar date, a distinction that means the observance falls on a different secular date each year and requires observant families to track the Hebrew date specifically, often with the help of published or digital yahrzeit calendars synchronising Hebrew and civil years across a lifetime of remembrance. The observance centres on a small number of specific, consistently practised acts: lighting a candle that burns for a full twenty four hours, reciting the Mourner's Kaddish in the presence of a minyan, the quorum of ten adult Jews required for full communal prayer, and, among many observant Jews, additional voluntary acts of devotion or merit on the day, including fasting by some, studying a tractate of Mishnah connected to the deceased's name, or giving charity in the deceased's memory, practices intended to bring ongoing spiritual benefit to the deceased's soul through the living relative's continued religious action on their behalf.