Portal:Atlas

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The Atlas Portal

Political and physical world map from the end of 2005

An atlas is a collection of maps, traditionally bound into book form, but now found in multimedia formats. As well as geographic features and political boundaries, many often feature geopolitical, social, religious and economic statistics.

The first book that could be called an atlas was constructed from the calculations of Claudius Ptolemy, a Greek geographer working in Alexandria circa A.D. 150. The first edition was published in Bologna in 1477 and was illustrated with a set of 27 maps, though scholars say that it is not known whether the printed maps were engraved versions of original maps made by Ptolemy, or whether they were constructed by medieval Greek scholars from Ptolemy's text.

Atlas of Greek mythology

The origin of the term atlas is a common source of misconception, perhaps because two different mythical figures named 'Atlas' are associated with mapmaking. King Atlas, a mythical King of Mauretania, was, according to legend, a wise philosopher, mathematician and astronomer who supposedly made the first celestial globe. However, the more widely known Atlas is a figure from Greek mythology.

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Tracks of all tropical cyclones, 1985 to 2005
Credit: Nilfanion
Map of the cumulative tracks of all tropical cyclones during the 1985–2005 time period. The Pacific Ocean west of the International Date Line sees more tropical cyclones than any other basin, while there is almost no activity in the Atlantic Ocean south of the Equator.

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Map of Earth showing lines of latitude (horizontally) and longitude (vertically)

A geographic coordinate system enables every location on the Earth to be specified in three coordinates, using mainly a spherical coordinate system. The Earth is not a sphere, but an irregular shape approximating an ellipsoid; the challenge is to define a coordinate system that can accurately state each topographical feature as an unambiguous set of numbers.

Latitude is the angle from a point on the Earth's surface and the equatorial plane, measured from the centre of the sphere. The north pole is 90° N; the south pole is 90° S. The 0° parallel of latitude is designated the equator. The equator is the fundamental plane of all geographic coordinate systems. The equator divides the globe into Northern and Southern Hemispheres. Longitude is the angle east or west of a reference meridian between the two geographical poles to another meridian that passes through an arbitrary point. All meridians are halves of great circles, and are not parallel. They converge at the north and south poles.

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Star map by Su Song

Su Song (10201101 AD) was a renowned Chinese statesman, astronomer, cartographer, horologist, pharmacologist, mineralogist, zoologist, botanist, mechanical and architectural engineer, and ambassador of the Song Dynasty.

Su Song was the engineer of a water-driven astronomical clock tower in medieval Kaifeng depicted in his horological treatise, Xin Yi Xiang Fa Yao, which employed the use of an early escapement mechanism, armillary sphere and the oldest known endless power-transmitting chain drive, called the tian ti, or "celestial ladder". He also completed a large celestial atlas of several star maps, several terrestrial maps, as well as a treatise on pharmacology.

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