Eugen Mittwoch Eugen Mittwoch Eugen Mittwoch (December 4, 1876 - November 8, 1942) was the founder of Modern Islamic Studies in Germany, and at the same time an eminent Jewish scholar. Coming from an old Orthodox Jewish family, Mittwoch was born in Schrimm, Prussian Province of Posen, Imperial Germany (now Srem in Poland). He initially wanted to become a Rabbi. During his studies in Berlin he discovered Islamic studies and did his doctorate with Eduard Sachau. During World War I, Mittwoch was the head of the German Nachrichtenstelle für den Orient from 1916 until 1918. After the agency initially employed people who
Determination of the day of the week his collected works in 1927. Gauss' method was applicable to the Gregorian calendar. He numbered the weekdays from 0 to 6 starting with Sunday. He defined the following operation: The weekday of 1 January in year number is where is the remainder after division of by , or modulo . This formula was also converted into graphical and tabular methods for calculating any day of the week by Kraitchik and Schwerdtfeger. Another variation of the above algorithm likewise works with no lookup tables. A slight disadvantage is the unusual month and year counting convention. The formula is where For example,