He was the son of Pheidias, an astronomer, and was on intimate terms with, if not related to, Hiero, king of Syracuse, and Gelo his son.
Sir William Herschel was the first astronomer who measured position angles; the instrument he employed is described in Phil.
In the middle of this slide a stiffly fitting brass disk is inserted, to which a small turn-table motion may be communicated by an attached arm, acted on by two fine opposing screws accessible to the astronomer; and by their means the " fixed web " may be rendered strictly parallel with the movable one.
The noted American astronomer, Benjamin Apthorp Gould (1824-1896).
EDUARD SCHONFELD (1828-1891), German astronomer, was born at Hildburghausen, in the duchy of Meiningen, on the 22nd of December 1828.
"SIR DAVID GILL (1843-1914), British astronomer, was born in Aberdeenshire June 12 18 4 3 and educated at the university of Aberdeen.
JOHN POND (c. 1767-1836), English astronomer-royal, was born about 1767 in London, where his father made a fortune in trade.
The formidable undertaking of reducing the accumulated planetary observations made at Greenwich from 1750 to 1830 was already in progress under Airy's supervision when he became Astronomer Royal.
In 1881 Sir George Airy resigned the office of Astronomer Royal and resided at the White House, Greenwich, not far from the Royal Observatory, until his death, which took place on the 2nd of January 1892.
CAROLINE LUCRETIA HERSCHEL (1750-1848), English astronomer, sister of Sir William Herschel, the eighth child and fourth daughter of her parents, was born at Hanover on the 16th of March 1750.
When her brother accepted the office of astronomer to George III., she became his constant assistant in his observations, and also executed the laborious calculations which were connected with them.
REGIOMONTANUS (1436-1476), German astronomer, was born at Konigsberg in Franconia on the 6th of June 1436.
The chief authority for the bishop's life is William de Chambre (printed in Wharton's Anglia Sacra, 1691, and in Historiae Dunelmensis scriptores tres, Surtees Soc. 1839), who describes him as an amiable and excellent man, charitable in his diocese, and the liberal patron of many learned men, among these being Thomas Bradwardine, afterwards archbishop of Canterbury, Richard Fitzralph, afterwards archbishop of Armagh, the enemy of the mendicant orders, Walter Burley, who translated Aristotle, John Mauduit the astronomer, Robert Holkot and Richard de Kilvington.
By the end of 1771 his scientific reputation was such that he was suggested for the post of "astronomer" to Captain Cook's second expedition to the South Seas, but his unorthodox opinions were objectionable to certain members of the board of longitude and the appointment was not ratified.
Elliptic orbits, and a parabolic orbit considered as the special case when the eccentricity of the ellipse is 1, are almost the only ones the astronomer has to consider, and our attention will therefore be confined to them in the present article.
When a new celestial body, say a planet or a comet is discovered, the astronomer meets with the problem of determining the orbit from several observed positions of the body.
Hipparchus, the famous astronomer, on the other hand, (c. 150 B.C.) proved a somewhat captious critic. He justly objected to the arbitrary network of the map of Eratosthenes.
Edmund Halley, the astronomer, compiled the first variation chart of scientific value (1683), as also a chart of the winds (1686).
Leonardo certainly was in relation with some persons belonging to that circle when he published in 1220 another more extensive work, De practica geometriae, which he dedicated to the imperial astronomer Dominicus Hispanus.
PAOLO FRISI (1728-1784), Italian mathematician and astronomer, was born at Milan on the 13th of April 1728.
JOHN BAINBRIDGE (1582-1643), English astronomer, was born at Ashby-de-la-Zouch, in Leicestershire.
CHRISTIAAN HUYGENS (1629-1695), Dutch mathematician, mechanician, astronomer and physicist, was born at the Hague on the 14th of April 1629.
JOHANN HEINRICH LAMBERT (1728-1777), German physicist, mathematician and astronomer, was born at Mulhausen, Alsace, on the 26th of August 1728.
Gabir ben Aflah of Sevilla, commonly called Geber, was a celebrated astronomer and apparently skilled in algebra, for it has been supposed that the word " algebra " is compounded from his name.
SAMUEL PIERPONT LANGLEY (1834-1906), American physicist and astronomer, was born at Roxbury, Boston, Massachusetts, on the 22nd of August 1834.
Astronomer comes from the Latin word astra, which means stars; and astronomers are men who study the stars, and tell us about them.