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observatory

(Encyclopedia)observatory, scientific facility especially equipped to detect and record naturally occurring scientific phenomena. Although geological and meteorological observatories exist, the term is generally ap...

Btu

(Encyclopedia)Btu: see British thermal unit.

ampere

(Encyclopedia)ampere ămˈpēr [key], abbr. amp or A, basic unit of electric current. It is the fundamental electrical unit used with the mks system of units of the metric system. The ampere is officially defined a...

Airy, Sir George Biddell

(Encyclopedia)Airy, Sir George Biddell, 1801–92, English astronomer. The son of a poor farmer, he distinguished himself as Senior Wrangler at Cambridge, where he was elected fellow of Trinity College (1824) and a...

Amici, Giovanni Battista

(Encyclopedia)Amici, Giovanni Battista jōvänˈnē bät-tēsˈtä ämēˈchē [key], 1786–1863, Italian astronomer, mathematician, and naturalist. He became director of the observatory and professor of astronomy...

Hagen, Johannes Georg

(Encyclopedia)Hagen, Johannes Georg yōhäˈnəs gāˈôrk häˈgən [key], 1847–1930, American astronomer and mathematician, b. Austria. A Jesuit, he came in 1880 to the United States to teach. In 1888 he was ma...

Juno, in astronomy

(Encyclopedia)Juno jo͞oˈnō [key], in astronomy, 3d asteroid to be discovered. It was found in 1804 by C. Harding. It has a diameter of c.120 mi (190 km). Its average distance from the sun is 2.67 astronomical un...

Loomis, Elias

(Encyclopedia)Loomis, Elias, 1811–89, American physicist and mathematician, b. Willington, Conn., grad. Yale, 1830. He taught at Western Reserve (1837–44), at New York Univ. (1844–47, 1849–60), and at Yale ...

English units of measurement

(Encyclopedia)English units of measurement, principal system of weights and measures used in a few nations, the only major industrial one being the United States. It actually consists of two related systems—the U...

dyne

(Encyclopedia)dyne dīn [key], unit of force in the cgs system of units, which is based on the metric system; an acceleration of 1 centimeter per second per second is produced when a force of 1 dyne is exerted on a...