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
Dydd Santes Dwynwen increased considerably in recent years, with special events, such as concerts and parties, often held and greetings cards printed. Although still not as popular as St Valentine's Day in February, St Dwynwen is certainly becoming better-known among today's population of Wales. A big boost for St Dwynwen’s Day came in 2003 when the Welsh Language Board (Bwrdd yr Iaith Gymraeg) teamed up with UK supermarket Tesco to distribute 50,000 free cards in 43 of its Welsh stores. One card was inserted with a special heart, the finder of which would be entitled to a prize. The board also suggested numerous