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.
JOHANN HEINRICH LAMBERT (1728-1777), German physicist, mathematician and astronomer, was born at Mulhausen, Alsace, on the 26th of August 1728.
SAMUEL PIERPONT LANGLEY (1834-1906), American physicist and astronomer, was born at Roxbury, Boston, Massachusetts, on the 22nd of August 1834.
The first volume (in two parts) is a detailed biography of the great astronomer; the second includes some of his minor writings and correspondence, family records, and historical documents of local interest.
"SIR DAVID GILL (1843-1914), British astronomer, was born in Aberdeenshire June 12 18 4 3 and educated at the university of Aberdeen.
He became Astronomer Royal in Cape Colony in 1879 and retained that post till 1902.
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.
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.
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.
JOHN BAINBRIDGE (1582-1643), English astronomer, was born at Ashby-de-la-Zouch, in Leicestershire.
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.
CHRISTIAAN HUYGENS (1629-1695), Dutch mathematician, mechanician, astronomer and physicist, was born at the Hague on the 14th of April 1629.
JOHANN FRANZ ENCKE (1791-1865), German astronomer, was born at Hamburg on the 23rd of September 1791.
See David Gill, Man and Astronomer, by George Forbes (1916).
After 1510), astronomer, wrote the Sephei Yuhasin, an historical work of importance.
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).
COPERNICUS (or [[Koppernigk), Nicolaus]] (1473-1543), Polish astronomer, was born on the 19th of February 1473, at Thorn in Prussian Poland, where his father, a native of Cracow, had settled as a wholesale trader.
As the powers of the telescope were gradually developed, it was found that the finest hairs or filaments of silk, or the thinnest silver wires that could be drawn, were much too thick for the refined purposes of the astronomer, as p p they entirely obliterated the image of a star in the more powerful telescopes.
CHARLES PRITCHARD (1808-1893), British astronomer, was born at Alberbury, Shropshire, on the 29th of February 1808.
Eastward of the present city, amongst the mounds and ruins of the old town, in a dilapidated chamber adjoining a bluedomed building over the grave of an imamzadeh, is the tomb of the astronomer-poet Omar Khayyam, an unsightly heap of plaster without inscription, and probably fictitious.
JOHN THOMAS ROMNEY ROBINSON (1792-1882), Irish astronomer and physicist, was born in Dublin on the 23rd of April 1792.
De Lacerda, an accomplished astronomer, was appointed to command a scientific expedition of discovery to the north of the Zambesi.
He was elected a fellow of the Royal Society on the 26th of February 1807; he married and went to live in London in the same year, and in 1811 succeeded Maskelyne as astronomer-royal.
About 1136), was a mathematician, astronomer and philosopher much studied in the middle ages.
In June 1835 Airy was appointed Astronomer Royal in succession to John Pond, and thus commenced that long career of wisely directed and vigorously sustained industry at the national observatory which, even more perhaps than his investigations in abstract science or theoretical astronomy, constitutes his chief title to fame.
SIR JOSEPH NORMAN LOCKYER (1836-), English astronomer, was born at Rugby on the 17th of May 1836.
JOSEPH NICOLAS DELISLE (1688-1768), French astronomer, was born at Paris on the 4th of April 1688.
Having founded an observatory there, he returned to Paris in 1747, was appointed geographical astronomer to the naval department with a salary of 3000 livres, and installed an observatory in the Hotel Cluny.
PIERRE JULES CESAR JANSSEN (1824-1907), French astronomer, was born in Paris on the 22nd of February 1824, and studied mathematics and physics at the faculty of sciences.