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	Edmond Halley - Wikipedia, the free encyclopedia
		Edmond Halley (sometimes "Edmund", November 8, 1656 – January 14, 1742) was an English astronomer, geophysicist, mathematician, meteorologist, and physicist.
		Halley was born at Haggerston, London, the son of a wealthy soapboiler.
		Edmond Halley, An Estimate of the Degrees of the Mortality of Mankind (1693).
	en.wikipedia.org /wiki/Edmond_Halley (888 words)

	THE HOLLOW WORLD OF EDMOND HALLEY
		Halley’s Earth was composed of an outer shell 500 miles thick, with an air gap of the same distance between it and the inner sphere.
		Halley was confident his readers would perceive the necessity of this: “should these globes be adjusted once to the same common centre, the Gravity of the parts of the Concave would press towards the centre of the inner ball...
		Halley, “An account of the cause of the change of the variation of the magnetical needle with an hypothesis of the structure of the internal parts of the Earth”, Philosophical transactions, xvi (1692), 563-87.
	www.ucl.ac.uk /sts/nk/halleyhollow.htm (3318 words)

	Edmond Halley
		Halley was fortunate to live through a period of scientific revolution that strengthened the foundation of modern science.
		Halley's masterpiece on comets, A Synopsis of the astronomy of comets (Astronomiae cometicae) published in 1705 laid the foundation of modern cometary study.
		Halley noted that their orbital features were identical except that the historic periods between their perihelion (the point nearest the Sun in the orbit of a planet, comet or man-made satellite) passages were different over 76 years between 1531 and 1607 and just under 75 years between 1607 and 1682.
	www.vigyanprasar.gov.in /scientists/EdmondHalley.htm (2508 words)

	Sea and Sky: Edmond Halley
		Edmond Halley was born on October 29, 1656 in the village of Haggerston, England.
		Halley was appointed Savilian professor of geometry at Oxford in 1704.
		Halley correctly surmised that the appearances of these comets were due to the reappearance of the same object whose orbit brought it close to the Sun every 76 years.
	www.seasky.org /spacexp/sky5e05.html (417 words)

	Edmond Halley
		Edmond, or Edmund, Halley (Born Haggerston, London, October 29, 1656 - Died January 14, 1742) was an English astronomer, geophysicist, mathematician, meteorologist, and physicist.
		Halley was the first to successfully predict the return, in 1758, of Halley's Comet.
		Halley was friends with Isaac Newton and helped convince him to write the Principia Mathematica Philosophiae Naturalis (1687).
	www.ebroadcast.com.au /lookup/encyclopedia/ed/Edmond_Halley.html (111 words)

	Comet Halley - Wikipedia, the free encyclopedia
		Although in every century many long-period comets appear brighter and more spectacular, Halley is the only short-period comet that is visible to the naked eye, and thus, the only naked-eye comet certain to return within a human lifetime.
		Halley's calculations enabled the comet's earlier appearances to be found in the historical record.
		The 1986 approach was the least favourable for Earth observers of all recorded passages of the comet throughout history: the comet did not achieve the spectacular brightness of some previous approaches, and with increased light pollution from urbanization, many people never saw the comet at all.
	en.wikipedia.org /wiki/Comet_Halley (1670 words)

	Sir Edmond Halley (Site not responding. Last check: 2007-10-11)
		Halley was intrigued by the theories of his contemporary Sir Isaac Newton and encouraged him to write the "Principia." When Newton finished this work in 1687, Halley paid out of his own pocket to have it published.
		Halley was made Astronomer Royal in 1721 and began an 18-year study on the phases of the moon.
		Halley's theory was proved correct in 1758 when the comet was again visible from Earth, but unfortunately he did not live long enough to see it.
	www.kidsnewsroom.org /elmer/infocentral/space/html/exploration/people/halley.html (218 words)

	Edmund Halley - MSN Encarta
		Edmond Halley (1656-1742), British astronomer, who first calculated the orbit of a comet.
		Halley was intrigued by the theories of the British physicist Sir Isaac Newton and encouraged him to write the Principia, which Halley then published in 1687 at his own expense.
		Halley's most important scientific treatise was Astronomiae Cometicae Synopsis (Synopsis on Cometary Astronomy), begun in 1682 and published in 1705.
	encarta.msn.com /encyclopedia_761553871/Edmund_Halley.html (165 words)

	The Galileo Project
		However, it does seem clear that Halley questioned (or better rejected) the universal authority of Scripture--for example, in his famous paper on the cause of the deluge and in his calculation of the age of the earth from the salinity of the sea, which yielded an age well beyond the accepted Scriptural chronology.
		Halley dedicated his map of the Atlantic (with isogonic lines of magnetic variation, 1701) to William III, and the world map on the same principles (1702) to Prince George.
		Halley's paper on gravity in 1687 was concerned with gunnery and trajectories.
	galileo.rice.edu /Catalog/NewFiles/halley.html (1490 words)

	Edmond Halley (Site not responding. Last check: 2007-10-11)
		Edmond Halley was born on October 29, 1656 in the village of Haggerston, England, which today, has been engulfed by the City of London.
		Edmond's father, Edmond Sr., was by some accounts a soapboiler and a salter.
		Halley attended the prestigious St. Paul's school, where in 1671, he was appointed captain; a position resembling today's student body president.
	www.geocities.com /CapeCanaveral/Hangar/6580/webdoc2.htm (152 words)

	ESA Science & Technology: Halley
		Halley is important because it was the first periodic comet to be recognised.
		Halley's nucleus, which is about 16 x 8 x 8 km, has a low density, indicating that it is probably porous.
		Using Isaac Newton's newly published theory of gravitation, Halley calculated the orbits of several comets and made the revolutionary suggestion that the bright comet seen in 1682 was the same object previously recorded in 1531 and 1607.
	sci.esa.int /science-e/www/object/index.cfm?fobjectid=31876 (352 words)

	Halley, Edmond - HighBeam Encyclopedia (Site not responding. Last check: 2007-10-11)
		HALLEY, EDMOND [Halley, Edmond], 1656-1742, English astronomer and mathematician.
		He is particularly noted as the first astronomer to predict the return of a comet and the first to point out the use of a transit of Venus in determining the parallax of the sun.
		On the basis of Newton's theory, Halley calculated the orbit of the great comet of 1682—since known as Halley's comet —and predicted its return in 1758.
	www.encyclopedia.com /doc/1E1-halley-e1.html (308 words)

	Edmond Halley (1656-1742)
		Edmond Halley was born in Hagerston, Middlesex, England (near London) as son of a wealthy merchant, salter and soapmaker.
		On his return, Halley was elected to the Royal Society on November 30, 1678, and King Charles II graduated him by mandate in 1679.
		In 1715, Halley published a summary of the variable ("New") stars known at that time, six in number (Halley 1715), and in 1716, a summary on the known "nebulae", also six (Halley 1716).
	www.seds.org /messier/xtra/Bios/halley.html (640 words)

	Halley biography
		Halley's work on these problems was disrupted during the following weeks by the difficulties surrounding his father's disappearance and death, but by August 1682 Halley was pursuing the problem further by visiting Newton in Cambridge.
		This was not as strange as it sounds, for Halley had been working on determining the longitude using variation of the compass and this was the main purpose of the voyage, although he was also required by William III to [Historia Math.
		Halley was appointed Savilian professor of geometry at Oxford in 1704 following the death of Wallis.
	www-history.mcs.st-andrews.ac.uk /Biographies/Halley.html (2617 words)

	Comet Halley
		In 1705 Edmond Halley predicted, using Newton's newly formulated laws of motion, that the comet seen in 1531, 1607, and 1682 would return in 1758 (which was, alas, after his death).
		Halley's orbit is retrograde and inclined 18 degrees to the ecliptic.
		The nucleus of Comet Halley is approximately 16x8x8 kilometers.
	seds.lpl.arizona.edu /nineplanets/nineplanets/halley.html (446 words)

	Sir Edmond Halley
		Edmond Halley (1656–1742) was an English astronomer best known for his prediction, published in 1705, of the return of the comet that is now named after him.
		In 1718 Halley discovered the proper motion of several bright stars by comparing their modern positions with those in ancient catalogues.
		The 8p stamp shows what is described as a “typical late 17th-century sextant”, equipped with telescopic sights, of the kind which Halley and his assistant used to measure the angular distances between pairs of stars.
	www.ianridpath.com /stamps/halley.htm (421 words)

	PSR Discoveries: Hot Idea: Comet Hale-Bopp
		It was Edmond Halley (1656-1742) along with his contemporary Sir Isaac Newton (1643-1727) who contributed to the first physical understanding of the nature of comets.
		Halley's first experience with comets was with the spectacular appearance of the comet of 1680, and of the comet of 1682 (which was later to bear his name) and he became very interested in understanding how they moved.
		Halley approached his friend, Isaac Newton, the only man capable of working out the proof - and was surprised to learn that Newton had solved the problem many years earlier, but had lost his notes.
	www.psrd.hawaii.edu /Feb97/History.html (1160 words)

	Edmond Halley — Infoplease.com
		Halley was the first man to recognize the recurring astronomical visitor now known as Halley's Comet.
		Halley was already interested in the stars when he entered Queen's College, Oxford at the age of 16.
		Halley became a professor at Oxford in 1704 and succeeded Flamsteed as Astronomer Royal in 1720.
	www.infoplease.com /biography/var/edmondhalley.html (345 words)

	BBC - History - Edmond Halley (1656 - 1742)
		Halley's star catalogue, published in 1678, was the first to contain telescopically determined locations of southern stars and that year he was elected a fellow of the Royal Society.
		Along with the inventor and microscopist Robert Hooke, Sir Christopher Wren and Sir Isaac Newton, Halley was trying to develop a mechanical explanation for planetary motion.
		Although progress had been made, Hooke and Halley were not able to deduce a theoretical orbit that would match the observed planetary motions.
	www.bbc.co.uk /history/historic_figures/halley_edmond.shtml (370 words)

	netcyclo: Halley, Edmond (Site not responding. Last check: 2007-10-11)
		Halley was the first to calculate the orbit of a comet.
		He showed that the comets of 1531, 1607, and 1682 were so similar that they must have been successive returns of the same comet—today known as Halley's comet.
		Halley accurately predicted the comet's return in 1758.
	www.netcyclo.com /people/h/edhalley/edhalley.htm (140 words)

	Amazon.com: Edmond Halley: Charting the Heavens and the Seas : Books: Alan Cook (Site not responding. Last check: 2007-10-11)
		Edmond Halley is famous for his comet - or more specifically for showing that the comet returned by calculating its orbit.
		Halley's time as the Royal Astronomer is documented, together with his fractious time at the Chester Mint during the recoinage overseen by Newton.
		Halley is shown as a man of action, a shaper, and a man prepared to trust his judgement in difficult circumstances.
	www.amazon.com /Edmond-Halley-Charting-Heavens-Seas/dp/0198500319 (1328 words)

	APOD: July 6, 1996 - Edmund Halley's Greatest Discoveries (Site not responding. Last check: 2007-10-11)
		Halley pioneered our understanding of trade winds, tides, cartography, naval navigation, mortality tables, and stellar proper motions.
		Halley (incorrectly) proposed that the Earth was made of concentric spheres the size of the inner planets each of which might contain life.
		Perhaps Halley's greatest discovery, however, was that his contemporary Isaac Newton had discovered a powerful mathematical formulation of gravity.
	antwrp.gsfc.nasa.gov /apod/ap960706.html (161 words)

	[58.01] Edmond Halleyâs prescient thinking on the nature of comets (Site not responding. Last check: 2007-10-11)
		Three centuries ago, Edmond Halley published a physically unimpressive treatise of only two dozen pages that was to change the astronomy of comets forever.
		Not only did Halley note the orbital similarities of the comets observed in 1531, 1607, and 1682 and predict the 1758 return of the comet that would bear his name, but he made several other insightful comments as well.
		Halley noted that the cometary orbits had no preferred inclination or perihelion distance, nor were any found to be on hyperbolic trajectories.
	www.aas.org /publications/baas/v37n4/aas207/207.htm (271 words)

	Wikinfo \| Edmond Halley (Site not responding. Last check: 2007-10-11)
		Edmond, or Edmund, Halley (October 29, 1656 - January 14, 1742) was an English astronomer, geophysicist, mathematician, meteorologist, and physicist.
		In 1698 he received a commission as captain of HMS Paramour to make extensive observations on the conditions of terrestrial magnetism.
		Images, some of which are used under the doctrine of Fair use or used with permission, may not be available.
	www.wikinfo.org /wiki.php?title=Edmond_Halley (541 words)

	Comet Halley (Site not responding. Last check: 2007-10-11)
		Tracing back in the historical records for recordings of bright comets and their positions in the sky, it was concluded that Halley had been observed periodically as far back as 240 B.C. The most recent return was in 1986, and the predicted next appearance of Halley in the inner Solar System will be in 2061.
		Notice that Halley's orbit extends essentially to the distance of Pluto, but when Halley is at its greatest distance from the Sun (aphelion) it is below the plane of the ecliptic (green color) while that portion of Pluto's orbit is above the plane of the ecliptic (blue color).
		It is a view of the orbit of Halley and its 1996 position from the vantage of the ecliptic plane:
	csep10.phys.utk.edu /astr161/lect/comets/halley.html (450 words)

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