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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...

Asada Goryu

(Encyclopedia)Asada Goryu äsäˈdä gôrˈyo͞o [key], 1734–99, Japanese astronomer who helped to introduce modern astronomical instruments and methods into Japan. Asada spent much of his career in the flourishi...

Mount Stromlo Observatory

(Encyclopedia)Mount Stromlo Observatory, astronomical observatory located on Mt. Stromlo, near Canberra, Australia. Established in 1924 (14 years after the first telescope was erected there), it has been operated b...

Flagstaff

(Encyclopedia)Flagstaff, city (2020 pop. 76,831), seat of Coconino co., N Ariz., near the San Francisco Peaks; inc. 1894. Lumbering, ranching, and a lively tourist tr...

Ames, Nathaniel

(Encyclopedia)Ames, Nathaniel, 1708–64, American almanac maker, b. Bridgewater, Mass. His Astronomical Diary and Almanack, begun in 1725 and issued annually after c.1732 from Dedham, Mass., was highly popular and...

Dunbar, William, American scientist

(Encyclopedia)Dunbar, William, 1749–1810, American scientist in the old Southwest, b. near Elgin, Scotland. He came to America in 1771. Commissioned by President Jefferson to investigate the Ouachita and Red Rive...

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...

Rutherfurd, Lewis Morris

(Encyclopedia)Rutherfurd, Lewis Morris rŭᵺˈərfərd [key], 1816–92, American physicist, b. New York City, grad. Williams, 1834. From 1837 to 1849 he practiced law. Rutherfurd studied and experimented in celes...

celestial mechanics

(Encyclopedia)celestial mechanics, the study of the motions of astronomical bodies as they move under the influence of their mutual gravitation. Celestial mechanics analyzes the orbital motions of planets, dwarf pl...

harmonic motion

(Encyclopedia)CE5 Harmonic motion is exhibited by a weight vibrating on the end of a spring. In A, the displacement of the object from its equilibrium position and the acceleration of the object are at a maximum...