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Albumazar

(Encyclopedia)Albumazar älˌbo͞omäˈzər [key], 805?–885, Arab astronomer, more fully Abu-Mashar Jafar ibn Muhammad. In his De magnis conjunctionibus he claimed that the world had been created when the seven p...

dog days

(Encyclopedia)dog days, name for the most sultry period of summer, from about July 3 to Aug. 11. Named in early times by observers in countries bordering the Mediterranean, the period was reckoned as extending from...

Young, Charles Augustus

(Encyclopedia)Young, Charles Augustus, 1834–1908, American astronomer, b. Hanover, N.H., grad. Dartmouth, 1853. He discovered the reversing layer of the solar atmosphere and proved the gaseous nature of the sun's...

retrograde motion

(Encyclopedia)retrograde motion, in astronomy, real or apparent movement of a planet, dwarf planet, moon, asteroid, or comet from east to west relative to the fixed stars. The most common direction of motion in the...

Tellus

(Encyclopedia)Tellus tĕlˈəs [key], in Roman religion, earth goddess; also called Terra Mater. As a goddess of fertility, she was worshiped at festivals held in January (in conjunction with Ceres) and in April. T...

transit

(Encyclopedia)transit, in astronomy, passage of a body across a meridian or passage of a small body across the visible disk of a larger one. (The passage of a large body across a smaller one is called an eclipse or...

Low, Frank James

(Encyclopedia)Low, Frank James, 1933–2009, American astronomer and physicist, b. Mobile, Ala., grad. Yale (B.S. 1955), Rice Univ. (M.A. 1957, Ph.D 1959). Low, who worked at Texas Instruments and the National Radi...

Möbius, Augustus Ferdinand

(Encyclopedia)Möbius, Augustus Ferdinand mōˈbēəs, Ger. möˈbēəs [key],(1790–1868), German mathematician and astronomer, b. Schulpforta, Saxony. A professor of astronomy at the Univ. of Leipzig, he made im...

Parma, city, United States

(Encyclopedia)Parma pärˈmə [key], city (1990 pop. 87,876), Cuyahoga co., NE Ohio, a suburb S of Cleveland; settled 1816, inc. 1924. Named for the Italian city of Parma, it is residential with a large industrial ...

astrometry

(Encyclopedia)astrometry: see astronomy.