William Herschel


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Herschel, William

 

(originally Friedrich Wilhelm). Born Nov. 15, 1738, in Hanover; died Aug. 25, 1822, at Slough, near London. British astronomer and optician. Member of the London Royal Society (from 1781) and honorary member of the St. Petersburg Academy of Sciences (1789).

The son of a regimental musician, Herschel was educated at home (music and languages). In 1757 he moved to England, where he became known as a musician, composer, and music teacher. Herschel, who studied astronomy on his own, made hundreds of mirrors for telescopes. Between 1786 and 1789 he built his largest, 40-ft (12-m) reflector with a mirror diameter of 122 cm, for the first time making effective use of a single-mirror scheme (Herschelian telescope). He began observations of the sky in 1773. Among his discoveries were the planet Uranus (Mar. 13, 1781), two satellites of Uranus (1787), their retrograde motion (1797), and two satellites of Saturn (1789); he also measured the period of rotation of Saturn and its rings (1790). He discovered the movement of the solar system through space. In the mid-1770’s he began a series of surveys of the stellar sky by his “scoop method” (counts of stars in selected areas). As a result, Herschel for the first time outlined the general form of our galaxy, estimating its dimensions and inferring that it was isolated in space as one of the stellar “islands” in the universe. Herschel interpreted the compact stellar condensations as actual clusters of stars. This work by Herschel marked the beginning of stellar statistics.

Herschel discovered the existence of binary stars (1803) and compiled three catalogs of double stars. One of his greatest contributions was the discovery of more than 2,500 new nebulas and star clusters (1786, 1789, and 1802). Herschel noted 182 double and multiple nebulas and guessed at the physical connection of their components. He ascertained for the first time (1784) a pattern of distribution of nebulas—their tendency to cluster in layers; the “stratum in Coma Berenices” that he singled out makes up a sizable part of the equatorial zone of the Vaucouleurs Supergalaxy (discovered in 1953). Herschel substantiated (1791) the existence of “true” nebulas—from rarefied self-luminous matter—and advanced the nebular stellar-cosmogonic hypothesis of the condensation of stars and their clusters from diffuse matter, developing it (1802 and 1811) into a conception of the evolution of cosmic matter. Herschel was one of the first to begin the study of the solar and stellar spectra and in 1800 discovered infrared rays in the solar spectrum.

Herschel was assisted in designing and making telescopes by his younger brother, Alexander, a talented mechanic; later he was assisted by his son, J. Herschel. Herschel received a great deal of help in his observations from his younger sister, Caroline Herschel (1750-1848), one of the few women astronomers.

WORKS

The Scientific Papers, vols. 1-2. London, 1912.

REFERENCES

Eremeeva, A. I. Vselennaia Gershelia. Moscow, 1966.
Eremeeva, A. I. Vydaiushchiesia astronomy mira. Moscow, 1966.
King, H. C. “Sir W. Herschel and the Discovery of Radiant Heat.” In Journal of the British Astronomical Association, 1955, vol. 65, no. 7.
Lovell, D. J. “Herschel’s Dilemma in the Interpretation of Thermal Radiation.” In Isis, 1968, vol. 59, no. 1, pp. 46-60.

A. I. EREMEEVA

References in periodicals archive ?
William Buckland, William Herschel, and John Herschel.
Among Hoskin's works are William Herschel and the Construction of the Heavens (1963, but recently reissued in a new edition), The Herschel Partnership: As Viewed by Caroline (2003), an edited volume that contains Caroline Herschel's two incomplete autobiographies (2003), and biographical studies of William and Caroline's parents plus their siblings in Tha Herschels of Hanover (2007):
It follows in the footsteps of William and Caroline Herschel in surveying the heavens, and it uses the planet that William Herschel discovered as a standard source.
The immigrant from Hanover, William Herschel started by financing his own astronomical research through the sale of reflecting telescopes that he manufactured himself but his discoveries were checked and announced by the current Astronomer Royal.
He convinced King George III to bankroll William Herschel, the astronomer who discovered Uranus and helped change our sense of the universe from a fixed landscape of stars to a volatile and doomed galaxy.
Chair of the judges, Sir Tim Hunt, FRS, Cancer Research UK and Nobel laureate, said "This is a book about real heroes, scientists like Joseph Banks, Humphrey Davy and William Herschel, who changed our understanding of the world forever.
It's hard to believe that 209 years have passed by since the infrared spectrum was accidentally located by William Herschel who in 1800 called it 'Dark Heat' and the first thermal image produced as evaporagraph by his son John Herschel in 1840.
For something really unusual, visit the Museum of East Asian Art and the William Herschel Museum of astronomy.
1781 German-born British astronomer William Herschel discovered the planet Uranus.
There are snippets from classic works by Ptolemy, Isaac Newton, Albert Einstein, and William Herschel, while the text ranges from the discovery of Halley's comet and shifts in the solar system to Barnard's photos of nebulae.
The Trifid has been observed by astronomers since the 1700s, and William Herschel actually cataloged the nebula as four separate objects by noting the dark lanes running through it.
William Herschel quickly became famous, gaining scientific honours and the King's keen interest.