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   ocr: The Windows Dictionary of Astronomy EX File Edit Index Search Bookmark History Notes Help Copy Print Index Search Bookmark History Notes Tables Read Help Cyclone and Anticyclone: Cyclones and anticyclones are circulation systems in the Atmosphere that can be considered, alternatively, as either producing, or resulting from, the ntermediate zones of high and low pressure between the equator and the poles. In cyclones, the central pressure is lower than that of the surrounding environment, and the flow of circulation is clockwise in the Southern Hemisphere and counter clockwise in the Northern H ...