Sir Harold Jeffreys, English astronomer, geophysicist and mathematician, born on 22 April, 1891 (died 18 March, 1989). In astronomy he proposed models for the structures of the outer planets, and studied the origin of the solar system. He calculated the surface temperatures of gas at less than -100°C, contradicting then accepted views of red-hot temperatures, but Jeffreys was shown to be correct when direct observations were made. In geophysics he researched the circulation of the atmosphere and earthquakes. Analysing earthquake waves (1926), he became the first to claim that the core of the Earth is molten fluid. Jeffreys also contributed to the general theory of dynamics, aerodynamics, relativity theory and plant ecology.
Posted on: Tue, 22 Apr 2014 04:52:09 +0000
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