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ephemeris time
(Encyclopedia) ephemeris time (ET), astronomical time defined by the orbital motions of the earth, moon, and planets. The earth does not rotate with uniform speed, so the solar day is an imprecise…Williams, Ephraim
(Encyclopedia) Williams, Ephraim, 1715–55, American soldier, founder of Williams College, b. Newton, Mass. After several years as a sailor, he lived in Massachusetts and took part in defending the…radar astronomy
(Encyclopedia) radar astronomy, application of radar to the determination of distances and planetary features within the solar system, such as rotation rates. A short burst of radio waves is…Ivanov, Vsevolod Vyacheslavovich
(Encyclopedia) Ivanov, Vsevolod VyacheslavovichIvanov, Vsevolod Vyacheslavovichfəsyĕˈvələt vyĕˌchĭsläˈvəvĭch [key]Ivanov, Vsevolod Vyacheslavovich ēväˈnôf [key], 1895–1963, Russian short-story writer…Halsey, William Frederick, Jr.
(Encyclopedia) Halsey, William Frederick, Jr. (Bull Halsey)Halsey, William Frederick, Jr.hôlˈsē [key], 1882–1959, American admiral, b. Elizabeth, N.J., grad. Annapolis, 1904. In World War II he led (…Hipparchus, Greek astronomer
(Encyclopedia) Hipparchus, fl. 2d cent. b.c., Greek astronomer, b. Nicaea, Bithynia. He is the first systematic astronomer of whom there are records. He made his observations chiefly on the island of…Moon Jae-in
(Encyclopedia) Moon Jae-in, 1953–, South Korean political leader, president of South Korea (2017–). The son of North Korean refugees, Moon studied law at Kyung Hee Univ. but was expelled twice for…space exploration
(Encyclopedia) CE5 Moon mission assembly CE5 Stages in a moon mission shown counterclockwise from launching on the first day to splashdown on the ninth day. space exploration, the…chantey
(Encyclopedia) chantey or shantychanteyboth: shănˈtē [key], work song with marked rhythm, particularly one sung by a group of sailors while hoisting sail or anchor or pushing the capstan. Often it…Rogge, Jacques
(Encyclopedia) Rogge, JacquesRogge, Jacqueszhäk rōˈkhə [key], 1942–, Belgian sports executive, b. Ghent. An orthopedic surgeon with a degree in sports medicine, Rogge is an accomplished sailor who…Trending
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