Official History of the Canadian Army in the Second World War did not appear in print until 1955 at the earliest. This was not unusual, in as an Official History of the First World War had also been many years in coming. Though the first of a projected eight volumes by Colonel Duguid first saw print in 1938, 20 years after the Armistice, the remaining 7 volumes were never completed. G.W.L. Nicholson published a one-volume Official History in 1964. The Royal Canadian Air Force's official Second World War history was not published until the 1990s. In Stacey's words: "Official History of the Canadian Army in the Second World War: Volume I.
Tug of war (astronomy) Tug of war (astronomy) The tug of war in astronomy is the ratio of planetary and solar attractions on a natural satellite. The term was coined by Isaac Asimov in "The Magazine of Fantasy and Science Fiction" in 1963. According to Isaac Newton's law of universal gravitation In this equation The two main attraction forces on a satellite are the attraction of the Sun and the satellite's primary (the planet the satellite orbits). Therefore, the two forces are where the subscripts "p" and "s" represent the primary and the sun respectively, and "m" is the mass of the satellite. The