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
Y Dydd Chronicle (1954). Y Dydd Y Dydd (established by Samuel Roberts in 1868) was a weekly liberal Welsh language newspaper that was distributed in North Wales. 'Y Dydd' contained general political and religious news and opinions. The paper briefly merged with 'Tyst Cymreig' to form 'Tyst a'r Dydd'; however, it reverted to 'Y Dydd' a year later. In 1954, 'Y Dydd' merged with 'Corwen Chronicle and Border Advertiser'. In 1992, 'Y Dydd' again became a separate publication. 'Y Dydd' was published by William Hughes. Associated titles: Tyst Cymreig (1870); Tyst a'r Dydd (1871); Corwen Chronicle and Border Advertiser (1954); Y Dydd