Leap week calendar week calendars would synchronize with the Gregorian every 400 years Note that the new years of the calendars shown need not be synchronised. The years according to ISO week date applied to months, i.e. a month has as many weeks as it has Thursdays, are shown depending on the weekday of 1 January, shaded weeks belong to the month they are labeled with in regular years and to the other adjoining one in leap years. Leap week calendar A leap week calendar is a calendar system with a whole number of weeks every year, and with every year starting on
Holy Week in Braga 313, and the determinations of the Council of Nicaea on the celebration of Easter. The first major testimony of the celebration of Holy week in Jerusalem, and the likely start of his imitation in multiple other places in the Christian world, is the travelogue Peregrinatio ad Loca Sancta or Itinerarium ad Loca Sancta (Pilgrimage / Itinerary to Holy Places) or, simply, Itinerarium Egeriae (Itinerary of Egeria) written by Egeria or Aetheria. This pilgrim was a woman of Gallaecia, probably even of Bracara Augusta (nowadays the city of Braga), that made his own pilgrimage to the Holy Land between 381 and