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Doldrums. The region of calms and variable winds in equatorial seas, often accompanied by heavy rain, thunderstorms and squalls.
The trade winds converging at a high angle at the equatorial trough, the "doldrums", form the intertropical convergence zone [ITCZ].
The regions in between, where there was sunny weather but no prevailing wind, were named the horse latitudes. The region near the equator where there was cloudy weather and no prevailing wind was called the doldrums.
See also: Aviation, Temperature, Force, Flight, Absolute
 
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