Ash Wednesday marks the beginning of Lent, an important time for Christians leading up to Easter. Here's what to know.

Holy Saturday marks the end of the Lenten season on April 19, it is a time to mourn the death of Jesus and to prepare for his resurrection. After sunset, the Easter Vigil is often celebrated it is a a liturgical tradition that celebrates the resurrection of Jesus Christ.

While Ash Wednesday frequently falls in February, it can take place anywhere from Feb. 4 through March 10, and this year, it falls closer to the latter. But why exactly does the religious holiday change dates,