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astrometry

(Encyclopedia)astrometry: see astronomy.

Hermes, in Greek religion and mythology

(Encyclopedia)Hermes, in Greek religion and mythology, son of Zeus and Maia. His functions were many, but he was primarily the messenger of the gods, particularly of Zeus, and conductor of souls to Hades. He was go...

Ganesa

(Encyclopedia)Ganesa gənāˈsə [key], b. 1507, d. after 1564, Indian astronomer. As a boy of 13 in a village N of Mumbai, Ganesa wrote a treatise on astronomy, the Grahalaghava, which has often been reprinted and...

Burnham, Sherburne Wesley

(Encyclopedia)Burnham, Sherburne Wesley, 1838–1921, American astronomer, b. Thetford, Vt. After serving as observer at Dearborn Observatory, Chicago (1877–81, 1882–84), and as astronomer at Lick Observatory (...

Reber, Gröte

(Encyclopedia)Reber, Gröte, 1911–2002, American radio engineer, b. Chicago, Ill. After graduating from the Armour Institute of Technology (now the Illinois Institute of Technology) in 1933, Reber worked for seve...

organometallic chemistry

(Encyclopedia)organometallic chemistry, the reactions and use of a class of compounds (R-M) that contain a covalent bond between carbon and metal. They are prepared either by direct reaction of the metal with an or...

Lowell, Percival

(Encyclopedia)Lowell, Percival, 1855–1916, American astronomer, b. Boston, grad. Harvard, 1876; brother of Abbott Lawrence Lowell and Amy Lowell. He visited Korea and Japan, where he acted as counselor and foreig...

Kuhn, Thomas Samuel

(Encyclopedia)Kuhn, Thomas Samuel, 1922–96, American philosopher and historian of science, b. Cincinnati, Ohio. He trained as a physicist at Harvard (Ph.D. 1949), where he taught the history of science from 1948 ...

Copernicus, Nicholas

(Encyclopedia)Copernicus, Nicholas kōpûrˈnĭkəs [key], Pol. Mikotaj Kopérnik, 1473–1543, Polish astronomer. After studying astronomy at the Univ. of Kraków, he spent a number of years in Italy studying vari...

sulfide

(Encyclopedia)sulfide, chemical compound containing sulfur and one other element or sulfur and a radical. Sulfides may be salts or esters of hydrogen sulfide, H2S, or may be formed directly, e.g., by heating a meta...