Christi Himmelfahrt, also known as the Feast of the Ascension, is a Christian holiday that commemorates the ascension of Jesus Christ into heaven. It is observed on the 40th day of Easter, which always falls on a Thursday, and occurs 39 days after Easter Sunday. This event is described in the New Testament, specifically in the books of Luke and Acts. In many countries, Christi Himmelfahrt is a public holiday, and people often participate in church services to celebrate the occasion. Traditions may include processions, family gatherings, and outdoor activities, as it often coincides with the arrival of spring.