Easter known as Holy Week, is very special in the Christian tradition. The Sunday before Easter is Palm Sunday, with the Wednesday before Easter being known as Spy Wednesday. The last three days before Easter are Maundy Thursday, Good Friday and Holy Saturday (sometimes referred to as Silent Saturday). Palm Sunday, Maundy Thursday and Good Friday respectively commemorate Jesus' entry in Jerusalem, the Last Supper and the Crucifixion. Maundy Thursday, Good Friday, and Holy Saturday are sometimes referred to as the Easter Triduum (Latin for "Three Days"). Many churches begin celebrating Easter late in the evening of Holy Saturday at a
360-day calendar used a 360 day calendar. Romans initially used a calendar which had 360 days, with varying length of months. The Rig Veda describes a calendar with twelve months and 360 days. In the Mayan Long Count Calendar, the equivalent of the year, the tun, was 360 days. A duration is calculated as an integral number of days between start date A and end date B. The difference in years, months and days are usually calculated separately: There are several methods commonly available which differ in the way that they handle the cases where the months are not 30 days long,