11 Nissan
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11 Nissan or Yud Aleph Nissan (Hebrew: י״א נִיסָן Yūʾd ʾAl ef Nī sān lit. 'the eleventh of Nissan') is a holiday on the Chabad-Lubavitch calendar that marks the birthday of the Lubavitcher Rebbe, Rabbi Menachem Mendel Schneerson. Rabbi Schneerson was born on April 5, 1902 corresponding to 11 Nissan 5662.