George Hadley developed Halley's theory of trade winds by taking into account the earth's rotation and the displacement of air by tropical heat. He was born in 1685 and died in 1768. Research Hadley
John Hadley was an English astronomer. He was born towards the end of the seventeenth century and died in 1744. He is the reputed inventor of the quadrant that goes by his name, though the honour is also claimed for Isaac Newton, from whom John Hadley got a description of the instrument in 1727, and for Thomas Godfrey of Philadelphia, who produced his instrument about the same time as John Hadley in 1731. The Royal Society decided that Thomas Godfrey and John Hadley were both entitled to the honour of the invention. John Hadley also invented the sextant. Research John Hadley
William Goffe was an English soldier. He was born in 1605 and died in 1679. He became a major-general in the English army, and was one of the judges who sentenced Charles I to death, and was prominent in political affairs during the Protectorate. Upon the restoration of Charles II, he fled to America in 1660, landing at Boston. He was concealed in New Haven from 1661 until 1664, when he went to Hadley, Massachusetts, where he remained until just before his death. Research William Goffe
In the atmosphere, a Hadley cell is a vertical circulation of air caused by convection. The typical
Hadley cells occur in the tropics, where hot air over the equator in the inter-tropical convergence zone rises, giving the heavy rain associated with tropical rainforests. In the upper atmosphere this now dry air then spreads north and south and, cooling, descends in the latitudes of the tropics, producing the North and South tropical desert belts. After that, the air is drawn back towards the equator, forming the North-East and South-East trade winds. Research Hadley cell
Abbreviations
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