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phase, in astronomy

(Encyclopedia) CE5 Phases of the moon phase, in astronomy, the measure of how much of the illuminated surface of a planet or satellite can be seen from a point at a distance from that body; the…

DK Space: Uranus

WHO DISCOVERED URANUS? WHAT ARE URANUS’S MOONS LIKE? FIND OUT MORETilted at 98°, Uranus seems to be spinning on its side. As it moves in its orbit, first one pole and then the other points straight…

DK Science: Uranus

THE RINGS OF URANUSBLAND ATMOSPHERETHE BIG FIVEBIOGRAPHY: WILLIAM HERSCHEL German, 1738-1822FIND OUT MOREEnglish astronomer William Herschel discovered Uranus in 1781. It was the first planet…

Famous Star Gazers

Eratosthenes 276–195 B.C. This Greek astronomer was the first to measure the size of Earth accurately. He determined that the earth's polar diameter was about 7,850 miles. (In fact, the distance is…

Bond, George Phillips

(Encyclopedia) Bond, George Phillips, 1825–65, American astronomer, b. near Boston, grad. Harvard, 1845. He became the assistant of his father, William Cranch Bond, and in 1859 succeeded him as…

eclipse

(Encyclopedia) CE5 A. Lunar eclipse B. Solar eclipse eclipseeclipseēklĭpsˈ, ĭ– [key] [Gr.,=failing], in astronomy, partial or total obscuring of one celestial body by the shadow of another. Best…

maria

(Encyclopedia) maria: see moon.

mascon

(Encyclopedia) mascon: see moon.

Langland, William

(Encyclopedia) Langland, William, c.1332–c.1400, putative author of Piers Plowman. He was born probably at Ledbury near the Welsh marshes and may have gone to school at Great Malvern Priory. Although…