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
Kiel Week at the "Spiellinie". Kiel Week is also one of the largest tall ship conventions in Germany, attracting many German and international traditional ships, mainly sailing ships. Many of them spend the week doing day tours out of Kiel, thus berthing much more in view of the festival visitors than the racing boats at Kiel-Schilksee. More than 100 traditional ships and hundreds of yachts usually participate in the Tall Ships Parade ("Windjammer‎parade") on the day before the closing day of the Kiel Week, i.e. usually on the second Saturday of Kiel Week. The Parade was first held in 1972, under the