Determination of the day of the week ISO 8601. The day designated with 7 may also be counted as "0", by applying the arithmetic modulo 7, which calculates the remainder of a number after division by 7. Thus, the number 7 is treated as 0, 8 as 1, 9 as 2, 18 as 4 and so on. If Sunday is counted as day 1, then 7 days later (i.e. day 8) is also a Sunday, and day 18 is the same as day 4, which is a Wednesday since this falls three days after Sunday. The basic approach of nearly all of the methods to calculate the
Responsories for Holy Week text are by Tomás Luis de Victoria (two settings for four voices: 1572 and 1585), Carlo Gesualdo (five voices: 1603; six voices: 1611), and Pablo Casals (mixed choir: 1932). Based on . A german version of the text of this responsory is set as "Der Gerechte kömmt um". Poulenc set it as the seventh of his "Sept répons des ténèbres". The three lessons for the third nocturn of Holy Saturday are , and respectively. Sixth of Poulenc's "Sept répons des ténèbres" Responsories for Holy Week Responsories for Holy Week (Latin: Responsoria pro hebdomada sancta) are three sets of nine responsories,