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The Intertropical Convergence Zone (ITCZ / ɪ tʃ / ITCH, or ICZ), [1] known by sailors as the doldrums [2] or the calms because of its monotonous windless weather, is the area where the northeast and the southeast trade winds converge. It encircles Earth near the thermal equator though its specific position varies seasonally.
English: Map of the world by Ottoman admiral Piri Reis, drawn in 1513. Only part of the original map survives and is held at the Topkapi Museum in Istanbul. The map synthesizes information from many maps, including one drawn by Christopher Columbus of the Caribbean.
World map from Theatrum Orbis Terrarum, by Abraham Ortelius 1935 map of Shanghai at Shanghai International Settlement , by the Army Map Service Map of the Exposition Universelle of 1900 , by GTC
The term originally derives from the early fourteenth century sense of trade (in late Middle English) still often meaning "path" or "track". [2] The Portuguese recognized the importance of the trade winds (then the volta do mar, meaning in Portuguese "turn of the sea" but also "return from the sea") in navigation in both the north and south Atlantic Ocean as early as the 15th century. [3]
The Piri Reis map is a world map compiled in 1513 by the Ottoman admiral and cartographer Piri Reis. Approximately one third of the map survives, housed in the Topkapı Palace in Istanbul . After the empire's 1517 conquest of Egypt , Piri Reis presented the 1513 world map to Ottoman Sultan Selim I ( r.
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Early world maps cover depictions of the world from the Iron Age to the Age of Discovery and the emergence of modern geography during the early modern period.Old maps provide information about places that were known in past times, as well as the philosophical and cultural basis of the map, which were often much different from modern cartography.