Yom Kippur is considered to be a Super Sabbath (Shabbat Shabbaton in Hebrew) -- a soul-searching opportunity for pious and evil people alike. Yom Kippur is observed on the 10th day of the Jewish month of Tishrei (September 16, 2021). Tishrei's astrological sign is Libra, which symbolizes the key themes of Yom Kippur: optimism, truth, justice, scales, humility, and tolerance. Libra is ruled by the planet Venus, which represents divine light and compassion.