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Davidson, George
(Encyclopedia) Davidson, George, 1825–1911, American geographer and astronomer, b. England. From 1845 to 1895 he was on the staff of the U.S. Coast and Geodetic Survey. He charted (1850–60) the U.S.…Valles Caldera National Preserve
(Encyclopedia) Valles Caldera National PreserveValles Caldera National Preserveväˈyās [key], 89,766 acres (36,343 hectares), N N.Mex.; est. 2000 by Valles Caldera Trust, transferred to National Park…sidereal time
(Encyclopedia) sidereal time (ST), time measured relative to the fixed stars; thus, the sidereal day is the period during which the earth completes one rotation on its axis so that some chosen star…Avogadro's number
(Encyclopedia) Avogadro's numberAvogadro's numberävōgäˈdrō [key] [for Amedeo Avogadro], number of particles contained in one mole of any substance; it is equal to 602,252,000,000,000,000,000,000, or…equatorial coordinate system
(Encyclopedia) CE5 Equatorial coordinate system equatorial coordinate system, the most commonly used astronomical coordinate system for indicating the positions of stars or other celestial…June 2016: Proposed Gun Control Measures Fail in Senate
World News | Disasters & Science News Here's a slideshow depicting the major U.S. news events of June 2016. 1. Shooting on UCLA Campus 2. Paul Ryan Endorses Trump 3. Stanford…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…liana
(Encyclopedia) lianalianalēäˈnə [key] or lianelianelēänˈ [key], name for any climbing plant that roots in the ground. The term is most often used for the woody vines that form a characteristic part…Tobias, Philip Valentine
(Encyclopedia) Tobias, Philip Valentine, 1925–2012, South African paleoanthropologist, b. Durban. He graduated from the Univ. of Witwatersrand (Ph.D., 1953) and taught there for five decades. Tobias…angle
(Encyclopedia) angle, in mathematics, figure formed by the intersection of two straight lines; the lines are called the sides of the angle and their point of intersection the vertex of the angle.…Trending
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