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Gezira, Al
(Encyclopedia)Gezira, Al äl jäzēˈrä [key], region, SE Sudan, occupying the tract between the White and Blue Niles south of their convergence at Khartoum. The Arabic word Gezira means “island” or “peninsu...declination
(Encyclopedia)declination, in astronomy, one of the coordinates in the equatorial coordinate system. The declination of a celestial body is its angular distance north or south of the celestial equator measured alon...culminate
(Encyclopedia)culminate, in astronomy, the maximum height in the sky reached by a celestial body on a given day. At the culminate the body is crossing the observer's celestial meridian and is said to be in upper tr...vertical circle
(Encyclopedia)vertical circle, in astronomy, the great circle on the celestial sphere that passes from the observer's zenith through a given celestial body. In the altazimuth coordinate system the altitude of a bod...health-care proxy
(Encyclopedia)health-care proxy, legal document in which a person assigns to another person, usually called an agent or proxy, the authority to make medical decisions in case of incapacitation. It is, in essence, a...Langley, Samuel Pierpont
(Encyclopedia)Langley, Samuel Pierpont, 1834–1906, American scientist, b. Roxbury, Mass., received only a high school education but continued his studies in science in Boston libraries. He became, in 1866, profes...right ascension
(Encyclopedia)right ascension, in astronomy, one of the coordinates in the equatorial coordinate system. The right ascension of a celestial body is the angular distance measured eastward from the vernal equinox alo...Provincetown Players
(Encyclopedia)Provincetown Players, American theatrical company that first introduced the plays of Eugene O'Neill. The company opened with his Bound East for Cardiff at the Wharf Theatre, Provincetown, on Cape Cod ...National Science Foundation
(Encyclopedia)National Science Foundation (NSF), an independent agency in the executive branch of the U.S. federal government concerned with promoting a national science policy by supporting basic research and educ...Cornu, Marie Alfred
(Encyclopedia)Cornu, Marie Alfred märēˈ älfrĕdˈ kôrnüˈ [key], 1841–1902, French physicist. From 1867 he was professor at the École polytechnique, Paris. He measured the velocity of light and made import...Browse by Subject
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