Tradition: Christianity-Orthodox
Link: http://www.hds.harvard.edu/life-at-hds/religious-and-spiritual-life/multifaith-calendar/about-the-multifaith-calendar
The celebration of Jesus’ ascension into heaven and enthronement as universal sovereign. It comes 40 days after Easter. The date observed by Protestants and Roman Catholics is often different from the date observed by Orthodox Christians, but in some years they fall on the same day.