Jeffreys , Sir Harold
(1891–1989) British astronomer and geophysicist
Jeffreys was born in Birtley in the northeast of England and educated in Newcastle upon Tyne and at Cambridge University. After graduating in 1913 he was made a fellow of his college. He was reader in geophysics from 1931 to 1946 before being elected to the Plumian Professorship of Astronomy and Experimental Philosophy where he remained until his retirement in 1958.
In 1924 Jeffreys produced one of the fundamental works in geophysics of the first half of the 20th century, The Earth: Its Origin, History, and Physical Constitution. In this he argued forcibly against Alfred Wegener's proposed theory of continental drift. He demonstrated that the forces proposed by Wegener were inadequate. This did much to inhibit interest and research into drift theory for a while but much new evidence in its favor has since been uncovered.
Jeffreys was also joint author, with Keith Bullen, of theSeismological Tables (1935). These, more frequently known as the JB Tables, were revised in 1940 and are the present standard tables of travel times of earthquake waves. They allow observers to determine from the elapsed time between the arrival of the primary (P) waves and the secondary (S) waves the distance between the observer and the earthquake.
Jeffreys's work in astronomy included studies on the origins of the universe. He developed James Jeans's theory of tidal evolution. He also devised models for the planetary structure of Jupiter, Saturn, Uranus, and Neptune.
He was knighted in 1953.

Scientists. . 2011.

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  • Jeffreys, Sir Harold — born April 22, 1891, Fatfield, Durham, Eng. died March 18, 1989, Cambridge, Cambridgeshire British astronomer and geophysicist. In astronomy, he established that the four large outer planets (Jupiter, Saturn, Uranus, and Neptune) are very cold,… …   Universalium

  • Jeffreys, Sir Harold — (22 abr. 1891, Fatfield, Durham, Inglaterra 18 mar. 1989, Cambridge, Cambridgeshire). Astrónomo y geofísico británico. En astronomía, estableció que los cuatro grandes planetas exteriores (Júpiter, Saturno, Urano y Neptuno) son extremadamente… …   Enciclopedia Universal

  • Harold Jeffreys — Naissance 22 avril 1891 Fatfield (Angleterre) Décès 18 mars 1989 Cambridge (Angleterre) Nationalité anglais Champs Mathématiques, géophysique …   Wikipédia en Français

  • Harold — /har euhld/, n. a male given name. * * * (as used in expressions) Alexander Harold Rupert Leofric George Alexander 1st Earl Arlen Harold Barton Sir Derek Harold Richard Bloom Harold Clurman Harold Edgar Crane Harold Hart James Harold Doolittle… …   Universalium

  • Harold — (as used in expressions) Alexander, Harold (Rupert Leofric George) Alexander, 1 conde Arlen, Harold Barton, Sir Derek H(arold) R(ichard) Harold George Belafonte, Jr. Bloom, Harold Clurman, Harold (Edgar) Crane, (Harold) Hart James Harold… …   Enciclopedia Universal

  • sir — /serr/, n. 1. a respectful or formal term of address used to a man: No, sir. 2. (cap.) the distinctive title of a knight or baronet: Sir Walter Scott. 3. (cap.) a title of respect for some notable personage of ancient times: Sir Pandarus of Troy …   Universalium

  • sir — (Voz inglesa.) ► sustantivo masculino Tratamiento honorífico empleado por los británicos. * * * sir (ingl.; pronunc. [ser]) m. *Tratamiento de respeto usado en Inglaterra delante de un nombre de hombre o para dirigirse a la persona de que se… …   Enciclopedia Universal

  • Harold Jeffreys — Sir Harold Jeffreys (* 22. April 1891 in Fatfield, County Durham, England; † 18. März 1989 in Cambridge, England) war ein britischer Mathematiker, Statistiker, Geophysiker und Astronom. Inhaltsverzeichnis 1 Leben und Wirken 2 …   Deutsch Wikipedia

  • Harold Jeffreys — Nacimiento 22 de abril de 1891 Fatfield, Washington, County Durham, Inglaterra Fallecimiento 18 de marzo de …   Wikipedia Español

  • Harold Jeffreys — Infobox Scientist name = Harold Jeffreys box width = image width =150px caption = Harold Jeffreys birth date = 22 April 1891 birth place = death date = 18 March 1989 death place = residence = citizenship = nationality = ethnicity = field =… …   Wikipedia

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