Harold Jeffreys (Jeffreys Harold)

(1891-1989)
Born April 22, 1891 in Fetfilde (County Durham). Studied at the Armstrong College (Newcastle-upon-Tyne) and St John's College, Cambridge University. After graduation he worked there, in 1917-1922 - in the meteorological service, in 1922-1958 - University of Cambridge (since 1946 - was a professor of astronomy and philosophy). But astronomers in the Netherlands. de Sitter Jeffries determine the amount of compression of the Earth's precession of its axis, set the parameters of the annual polar motion and rotation inertia. Compiled time curve of seismic waves, which is used to determine the epicenters of distant earthquakes foci. Following Dzh.Darvinom developed the theory of tidal evolution of the Earth - Moon, calculated the energy of tidal friction on the ocean coast. However Dzh.Dzhinsom developed the theory of tidal evolution of the solar system, estimated its age in a few billion years. Jeffries - by the fundamental work, the Earth: its origin, history and structure (The Earth: Its Origin, History, and Physical Constitution, 6 th ed., 1976). He owns and works on the application of probability theory to the analysis of astronomical observations. Jeffries was awarded many prestigious awards (the Copley medal of the London and the Royal Medal of the Royal Astronomical Society, the Victoria Medal of the Royal Society of Geodesy, Wollaston Medal of the Geological Society of London). In 1953 he was elevated to the dignity of knighthood. Jeffries died in Cambridge, March 18, 1989.