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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]
Volta do mar" manoeuvre during Henry the Navigator's (c.1430-1460) lifetime: Atlantic winds (green), currents (blue) and approximate Portuguese sailing routes (red): the further south ships went, the wider off sailing required to return. Note that the boundary between the westerlies and the trade winds moves north in summer and south in winter.
The trade winds (also called trades) are the prevailing pattern of easterly surface winds found in the tropics near the Earth's equator, [4] equatorward of the subtropical ridge. These winds blow predominantly from the northeast in the Northern Hemisphere and from the southeast in the Southern Hemisphere. [5]
Map of the five major ocean gyres Route from Philippines to Acapulco, Mexico Portuguese trade routes (blue) and the Spanish trade routes (white). Portuguese ships went almost to Brazil before rounding Africa and to the Azores before turning east to Lisbon. The Spanish Manila galleons used the northern Trade winds going west and the westerlies ...
George Hadley (12 February 1685 – 28 June 1768) was an English lawyer and amateur meteorologist who proposed the atmospheric mechanism by which the trade winds are sustained, which is now named in his honour as Hadley circulation. As a key factor in ensuring that European sailing vessels reached North American shores, understanding the trade ...
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The westerlies, anti-trades, [2] or prevailing westerlies, are prevailing winds from the west toward the east in the middle latitudes between 30 and 60 degrees latitude. They originate from the high-pressure areas in the horse latitudes (about 30 degrees) and trend towards the poles and steer extratropical cyclones in this general manner. [ 3 ]
Author George R.R. Martin has dropped a few hints on how he’s coming with his new novel, The Winds of Winter, the sixth in the A Song of Ice and Fire saga that formed the basis of HBO’s Game ...