Columbia Encyclopedia

(Encyclopedia) zenith, in astronomy, the point in the sky directly overhead; more precisely, it is the point at which the celestial sphere is intersected by an upward extension of a plumb line from the observer's lo...

(Encyclopedia) Ritchey, George Willis, 1864–1945, American astronomer, b. Meigs co., Ohio, studied at the Univ. of Cincinnati (1883–84, 1886–87). He was superintendent of instrument construction (1899–1904) ...

(Encyclopedia) Celsius, Anders änˈdərs sĕlˈsēŭs [key], 1701–44, Swedish astronomer. While professor of astronomy at the Univ. of Uppsala (1730–44), he traveled through Germany, France, and Italy, visiting...

(Encyclopedia) Chaldaea or Chaldea both: kăldēˈə [key], properly the southernmost portion of the valley of the Tigris and the Euphrates rivers. Sometimes it is extended to include Babylonia and thus comprises al...

(Encyclopedia) opposition, in astronomy, alignment of two celestial bodies on opposite sides of the sky as viewed from earth. Opposition of the moon or planets is often determined in reference to the sun. Only the s...

(Encyclopedia) color index, in astronomy, difference in an object's brightness as recorded between any two well-defined bands of the electromagnetic spectrum by using optical filters of different colors. If blue and...

(Encyclopedia) Behaim, Behem, or Boeheim, Martin all: bāˈhīm [key], b. 1436? or 1459?, d. 1506?, German traveler and cosmographer. He studied (possibly under Regiomontanus) astronomy, navigation, and mathematics....

(Encyclopedia) Apianus, Petrus pāˈtər bēˈnəvĭts, bĕnˈəvĭts [key], 1495–1552, German cosmographer and mathematician. He was professor of mathematics at Ingolstadt and was noted for his knowledge of astro...

(Encyclopedia) Moscow State University, at Moscow, Russia, officially M. V. Lomonosov Moscow State Univ.; founded 1755 as Moscow Univ. by the Russian scientist M. V. Lomonosov, renamed Moscow State Univ. after the R...

(Encyclopedia) Wren, Sir Christopher, 1632–1723, English architect. A mathematical prodigy, he studied at Oxford. He was professor of astronomy at Gresham College, London, from 1657 to 1661, when he became Savilia...