Edmond Halley, English polymath

Bildnummer 13502260
Edmond Halley, English polymath
Edmond Halley (1656-1742) was an English astronomer, geophysicist, mathematician, meteorologist, and physicist who is best known for computing the orbit of the comet that was named for him. In 1676, Halley visited the south Atlantic island of Saint Helena and set up an observatory with a 24-foot-long telescope so he could study the stars of the Southern Hemisphere. In 1678 he published Catalogus Stellarum Australium which included details of 341 southern stars. In 1686 Halley published the second part of the results from his Helenian expedition, being a paper and chart on trade winds and monsoons. In this he identified solar heating as the cause of atmospheric motions. He also established the relationship between barometric pressure and height above sea level. His charts were an important contribution to the emerging field of information visualization. In 1691, Halley built a diving bell, a device in which the atmosphere was replenished by way of weighted barrels of air sent down from the surface. In 1718 he discovered the proper motion of the 'fixed' stars by comparing his astrometric measurements with those given in Ptolemy's Almagest. He was the second Astronomer Royal in Britain. A position he held until his death in 1742 at the age of 85.
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