Question: the day of was the holiest day on the hebrew calendar
Answer: Yom Kippur ( / jɔːm , joʊm , jɒm ˈkɪpər , kɪˈpʊər / ; Hebrew : יוֹם כִּיפּוּר ‬ , IPA : ( ˈjom kiˈpuʁ ) , or יום הכיפורים ‬ ) , also known as the Day of Atonement , is the holiest day of the year in Judaism .