Dr Augustin Sokolovski
On the seventh day after the celebration of the Descent of the Holy Spirit upon the Apostles, the Orthodox Church celebrates the end of Pentecost. Thus, including the feast day itself, Pentecost lasts exactly seven days.
Starting the day after the end of Pentecost, All Saints’ Sunday, a new count of Sundays begins. Thus, All Saints' Day marks the beginning of a new count of Sundays—33 in number, corresponding to the number of years of Jesus' earthly life—which will continue until the start of the Sundays leading up to Great Lent.
This marks the beginning of a new season, a fresh start — the perfect time for Christians to wish one another a Happy New Year and a Happy New Church Season.