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Loosely speaking, it seemed as if classically minded geographers favored the 12-wind system, but those of more practical bent preferred the 8-wind system. As the Dark Ages advanced, it could be expected for the 8-wind rose to prevail, but the guardians of classical knowledge, such as St. Isidore of Seville, preserved the 12-wind system for ...
In meteorology, prevailing wind in a region of the Earth's surface is a surface wind that blows predominantly from a particular direction. The dominant winds are the trends in direction of wind with the highest speed over a particular point on the Earth's surface at any given time.
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The Romans (e.g. Seneca, Pliny) adopted the Greek 12-wind system, and replaced its names with Latin equivalents, e.g. Septentrio, Subsolanus, Auster, Favonius, etc. The De architectura of the Roman architect Vitruvius describes 24 winds. [3] Classical 12-wind rose, with Greek (blue) and Latin (red) names (from Seneca)
Before the development of the compass rose, a wind rose was included on maps in order to let the reader know which directions the 8 major winds (and sometimes 8 half-winds and 16 quarter-winds) blew within the plan view. No differentiation was made between cardinal directions and the winds which blew from those directions.
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 ]
From July 2011 to December 2012, if you bought shares in companies when Elaine L. Chao joined the board, and sold them when she left, you would have a 19.2 percent return on your investment, compared to a 6.5 percent return from the S&P 500.
Continental climates exist where cold air masses infiltrate during the winter from shorter days and warm air masses form in summer under conditions of high sun and longer days. Places with continental climates are as a rule either far from any moderating effect of oceans or are so situated that prevailing winds tend to head offshore. [6]