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ephemeris
(Encyclopedia)ephemeris ĭfĕmˈərĭs [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 is the oldest of th...Antipodes, islands, New Zealand
(Encyclopedia)Antipodes ăntĭpˈədēz [key], rocky uninhabited islands, 24 sq mi (62 sq km), South Pacific, c.550 mi (885 km) SE of New Zealand, to which they belong. Explored by British seamen in 1800, the Antip...average
(Encyclopedia)average, number used to represent or characterize a group of numbers. The most common type of average is the arithmetic mean. See median; mode. ...Wallace, Edgar
(Encyclopedia)Wallace, Edgar (Richard Horatio Edgar Wallace), 1875–1932, English novelist and playwright, b. Greenwich. He was the author of more than 150 detective and adventure novels, of which as many as 5 mil...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 object whose sha...Graham, George
(Encyclopedia)Graham, George, 1674?–1751, English instrument maker. A clockmaker by trade, Graham designed clocks and watches that earned him membership in the Royal Society and were still manufactured into the p...Tompion, Thomas
(Encyclopedia)Tompion, Thomas, 1639?–1713, English clockmaker. When the Royal Observatory at Greenwich was established in 1676, Tompion was chosen to make two clocks, to be wound only once a year, which proved to...longitude
(Encyclopedia)longitude lŏnˈjĭto͞odˌ [key], angular distance on the earth's surface measured along any latitude line such as the equator east or west of the prime meridian. A meridian of longitude is an imagin...Blackheath
(Encyclopedia)Blackheath, common, 267 acres (108 hectares) in Lewisham and Greenwich boroughs, London, England. It was the gathering place of highwaymen and of several martial groups, including the followers of Wat...Airy, Sir George Biddell
(Encyclopedia)Airy, Sir George Biddell, 1801–92, English astronomer. The son of a poor farmer, he distinguished himself as Senior Wrangler at Cambridge, where he was elected fellow of Trinity College (1824) and a...Browse by Subject
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