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In Eastern Christianity, Sunday of the Publican and Pharisee: Triodion Begins Today, which is the Sunday after the Sunday of Zacchaeus and Sunday before Sunday of the Prodigal Son, begins the Lenten Triodion (the liturgical book used in the services of Great Lent,) and is the pre-Lenten start of the Easter cycle of worship.
Here are some ways you can observe this day according to Eastern Christian tradition: