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
Three-Day Week Three-Day Week The Three-Day Week was one of several measures introduced in the United Kingdom by the Conservative Government to conserve electricity, the generation of which was severely restricted owing to industrial action by coal miners. The effect was that from 1 January until 7 March 1974 (also the same month the 1973-74 oil crisis ended) commercial users of electricity were limited to three specified consecutive days' consumption each week and prohibited from working longer hours on those days. Services deemed essential (e.g. hospitals, supermarkets and newspaper prints) were exempt. Television companies were required to cease broadcasting at 10:30 p.m.