Biography Category
c.50,000 sq mi (130,000 sq km), barren region of central Australia, predominantly in the southeastern portion of the Northern Territory, extending S i...
(s j´ sm nd, s g´–) (KEY) , 1368–1437, Holy Roman emperor (1433–37), German king (1410–37), king of Hungary (1387–1437) and of Bohemia (14...
(py r zhül s zär´ zhäNs n´) (KEY) , 1824–1907, French astronomer. In 1857–58, in Peru, he worked on the determination of the magnetic equator...
metallic chemical element; symbol Ag [Lat. argentum]; at. no. 47; at. wt. 107.8682; m.p. 961.93°C; b.p. 2,212°C; sp. gr. 10.5 at 20°C; valence +1 o...
1877–1957, American astronomer, b. Oyster Bay, N.Y., grad. Princeton, 1897. In 1902 he went to Cambridge, England, to study. He returned to Princeto...
(p r j ´n ) (KEY) , c.1445–1523?, Umbrian painter, b. near Perugia. His real name was Pietro di Cristoforo Vannucci. Perugino is, after Raphael, th...