Yom Kippur is the Day of Atonement. It is the holiest day of the year in the Jewish calendar. It is the crown jewel of the High Holy Days. Yom Kippur is a day of personal and communal reflection. This year (2019), Yom Kippur begins at sundown on Tuesday October 8 and ends at sundown on Wednesday October 9.
Like Rosh HaShanah 10 days earlier, the central themes of Yom Kippur are teshuva (turning from wrong) and repentance. Both holy days along with the time in between is a magical time of restoring order and balance to our lives. It is no wonder that Yom Kippur falls during the month ruled by Libra. Traditionally speaking, this is the day when G-d weighs our souls in the balance and determines our fate for the year. It is a solemn time, yes, but it is also a joyous time. If we properly prepare ourselves and observe the day,we will merit favor for another year.
If done correctly, Yom Kippur is the conclusion of 40 days of soulful reflection. The month of Elul (the month preceding Tishrei when the High Holy Days occur) is a month of introspection and reflection. This is intensified on Rosh HaShanah when we come together as a community and publicly for prayer and introspection. Ten days later on Yom Kippur we come together once more for a final day of admitting our wrongdoings and seeking forgiveness. On this day, after 40 days of reflection, we again find balance in our lives. Our wrongs from the previous year break us, but on Yom Kippur we are able to be merged together again in wholeness.