Determination of the day of the week row C) to find the dominical letter that is E. The letter for September 18 is B, so the day of the week is Thursday. Use 16 (in the Julian century row, column E) and 76 (in row D) to find the dominical letter that is A. February 23 is a "D" day, so the day of the week is Wednesday. In a handwritten note in a collection of astronomical tables, Carl Friedrich Gauss described a method for calculating the day of the week for 1 January in any given year. He never published it. It was finally included in
IAU 100 km European Championships IAU 100 km European Championships The IAU 100 km European Championships is an annual, ultrarunning competition over 100 kilometres for European athletes. It is organised by the International Association of Ultrarunners (IAU) and was first held in 1992 – five years after the launched of the World Championships for the distance. The competition features both an individual and national team component. The team race is decided by aggregated the three best times set by a nation's athletes. In its 22nd edition in 2013, a total of 94 athletes representing 19 countries took part in the competition. Winschoten in the Netherlands