This is the first day of Lent. Occurring 46 days before Easter, it is a moveable fast that can fall as early as February 4 and as late as March 10. According to the canonical gospels of Matthew, Mark and Luke; Jesus spent 40 days fasting in the desert, where he endured temptation by Satan. Ash Wednesday marks the beginning of this 40-day liturgical period of prayer and fasting or abstinence. Of the 46 days until Easter, six are Sundays. As the Christian Sabbath, Sundays are not included in the fasting period and are instead "feast" days during Lent. Ash Wednesday derives its name from the practice of placing ashes on the foreheads of adherents as a celebration and reminder of human mortality, and as a sign of mourning and repentance to God. The ashes used are typically gathered from the burning of the palms from the previous year's Palm Sunday.