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 50 km World Championships for those years, moving the competition away from its tradition of changing host each year. The competition signalled commitment to the sport in Qatar, with Doha hosting its first ultramarathon in the months preceding the 2014 championship. It is one of four world championships organised by the IAU, with the others being the IAU 100 km World Championships, IAU 24 Hour World Championship and the IAU Trail Running World Championships. The inaugural edition in 2005 incorporated a European Championship race. Oleg Kharitonov was the men's winner, with World Trophy winner Sandor Barcza as runner-up and Stefano Sartori in third. The