DYSON, SIR FRANK WATSON British astronomer, was born at Ashby-de-la-Zouch, Leicestershire, on Jan. 8, 1868, and was educated at Bradford Grammar School and Trinity College, Cambridge, where he was second wrangler and Smith's Prizeman. In 1894 he became chief assistant at the Royal Observatory, Greenwich, and in 1905 was made as tronomer royal of Scotland, a position which he held until his return to Greenwich as astronomer royal of England (1910-33). From 1899 to 1905 he was secretary of the Royal Astronomical Society. He was elected F.R.S. in 19o1, subsequently serving on the council, and was in 1921 awarded the royal medal for his numerous contributions to astronomy, and especially for his important investigations of the distribution and movements of stars and the bearing of these upon the structure of the stellar universe. His observations of the spectrum of the corona and chromosphere during eclipses of the sun were published in Deter mination of Wave Length from Spectra Obtained at the Total Solar Eclipses of 1900, 190r and 1905 (1906) . Knighted in 1915, he was created K.B.E. in 1926. He also wrote Astronomy, a handy manual for students and others (1912), and many valuable con tributions to the Quarterly Journal of Mathematics, etc.