lines of longitude
121Colorado — This article is about the U.S. state of Colorado. For the former U.S. territory, see Colorado Territory. For the river, see Colorado River. For the physiographic region, see Colorado Plateau. For other uses, see Colorado (disambiguation). State… …
122Roman surface — The Roman surface (so called because Jakob Steiner was in Rome when he thought of it) is a self intersecting mapping of the real projective plane into three dimensional space, with an unusually high degree of symmetry. The mapping is not an… …
123Geodetic system — For other uses, see Geodetic. Geodesy Fundamentals …
124Jupiter — /jooh pi teuhr/, n. 1. Also called Jove. the supreme deity of the ancient Romans: the god of the heavens and of weather. Cf. Zeus. 2. Astron. the planet fifth in order from the sun, having an equatorial diameter of 88,729 mi. (142,796 km), a mean …
125Mercator, Gerardus — orig. Gerard Kremer born March 5, 1512, Rupelmonde, Flanders died Dec. 2, 1594, Duisburg, Duchy of Cleve Flemish cartographer. He received a master s degree in 1532 from the University of Louvain (Belgium), where he settled. By 24 he was a… …
126Squaring the circle — Squaring the circle: the areas of this square and this circle are equal. In 1882, it was proven that this figure cannot be constructed in a finite number of steps with an idealized compass and straightedge …
127geomagnetic field — Magnetic field associated with the Earth. It is essentially dipolar (i.e., it has two poles, the northern and southern magnetic poles) on the Earth s surface. Away from the surface, the field becomes distorted. Most geomagnetists explain the… …
128astronomical map — Introduction any cartographic representation of the stars, galaxies, or surfaces of the planets and the Moon. Modern maps of this kind are based on a coordinate system analagous to geographic latitude and longitude. In most cases, modern… …
