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Quetelet, Adolphe
(Encyclopedia) Quetelet, AdolpheQuetelet, Adolpheädôlfˈ kĕtəlāˈ [key], 1796–1874, Belgian statistician and astronomer. He was the first director (1828) of the Royal Observatory at Brussels. As…ephemeris
(Encyclopedia) ephemerisephemerisĭfĕmˈərĭs [key] (pl., ephemerides), table listing the position of one or more celestial bodies for each day of the year. The French publication Connaissance de Temps…universal time
(Encyclopedia) universal time (UT), the international time standard common to every place in the world, it nominally reflects the mean solar time along the earth's prime meridian (renumbered to…sundial
(Encyclopedia) sundial, instrument that indicates the time of day by the shadow, cast on a surface marked to show hours or fractions of hours, of an object on which the sun's rays fall. Although any…Hubble Space Telescope
The $2 billion Edwin P. Hubble Space Telescope (HST) was lifted into orbit by the space shuttle Discovery on April 24, 1990. Weighing approximately 25,500 lb (11,000 kg) and measuring 43 ft (…Foucault, Jean Bernard Léon
(Encyclopedia) Foucault, Jean Bernard LéonFoucault, Jean Bernard LéonzhäN bĕrnärˈ lāôNˈ f&oomacr;kōˈ [key], 1819–68, French physicist. Known especially for his research on the speed of light, he…Greenwich mean time
(Encyclopedia) Greenwich mean time or Greenwich meridian time (GMT), the former name for mean solar time at the site of the Royal Observatory in Greenwich, England, which is located on the prime…Dyson, Sir Frank Watson
(Encyclopedia) Dyson, Sir Frank WatsonDyson, Sir Frank Watsondīˈsən [key], 1868–1939, English astronomer, b. Ashby-de-la-Zouch, grad. Cambridge. He was astronomer royal of Scotland (1905–10) and of…Lamont, Johann von
(Encyclopedia) Lamont, Johann vonLamont, Johann vonyōˈhän fən läˈmônt [key], 1805–79, Scottish-German astronomer and magnetician, b. Scotland. In 1817 he went to Ratisbon to study at the seminary. He…Eudoxus of Cnidus
(Encyclopedia) Eudoxus of CnidusEudoxus of Cnidusy&oomacr;dŏkˈsəs, nīˈdəs [key], 408?–355? b.c., Greek astronomer, mathematician, and physician. From the accounts of various ancient writers, he…Trending
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