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Time Measurement, Time Zones, and the International Date Line
How we structure time The two natural cycles on which time measurements are based are the year and the day. The year is defined as the time required for Earth to complete one revolution around the…Transandine Railway
(Encyclopedia) Transandine Railway, former rail line, 156 mi (251 km) long, between Mendoza, Argentina, and Los Andes, Chile, traversing the Andes at Uspallata Pass. Opened to traffic in 1910, the…staff
(Encyclopedia) staff, in musical notation, a set of horizontal lines upon and between which notes are written so as to determine their relative pitch, and in connection with a clef, their absolute…Baghdad Railway
(Encyclopedia) Baghdad Railway, railroad of international importance linking Europe with Asia Minor and the Middle East. The line runs from İstanbul, Turkey, to Basra, Iraq; it connected what were…Lobachevsky, Nikolai Ivanovich
(Encyclopedia) Lobachevsky, Nikolai IvanovichLobachevsky, Nikolai Ivanovichnyĭkəlīˈ ēväˈnəvĭch ləbəchĕfˈskē [key], 1793–1856, Russian mathematician. A pioneer in non-Euclidean geometry, he challenged…cylinder
(Encyclopedia) CE5 Cylinder cylinder, in mathematics, surface generated by a line moving parallel to a given fixed line and continually intersecting a given fixed curve called the directrix; each…Rzhev
(Encyclopedia) RzhevRzhevərzhĕfˈ [key], city (1989 est. pop. 70,000), NW European Russia, on the Volga River and on a major rail line to Moscow. It has textile plants and repair shops for railroad…Golden Section
(Encyclopedia) CE5 Rectangle ABCD is a golden rectangle. Removing the square AEFD leaves the rectangle EBCF Golden Section, in mathematics, division of a line segment into two segments such that…hyperbole
(Encyclopedia) hyperbolehyperbolehīpûrˈbəlē [key], a figure of speech in which exceptional exaggeration is deliberately used for emphasis rather than deception. Andrew Marvell employed hyperbole…analytic geometry
(Encyclopedia) analytic geometry, branch of geometry in which points are represented with respect to a coordinate system, such as Cartesian coordinates, and in which the approach to geometric…Trending
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