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equatorial coordinate system

(Encyclopedia)CE5 Equatorial coordinate system equatorial coordinate system, the most commonly used astronomical coordinate system for indicating the positions of stars or other celestial objects on the celesti...

Kepler's laws

(Encyclopedia)CE5 Schematic representation of Kepler's second law: The areas ABF and A′B′F′ are equal and are swept out in equal intervals of time by a planet orbiting around the sun (at F). Kepler's laws...

balance

(Encyclopedia)balance, instrument used in laboratories and pharmacies to measure the mass or weight of a body. A balance functions by measuring the force of gravity that the earth exerts on an object, i.e., its wei...

Oregon Trail

(Encyclopedia)Oregon Trail, overland emigrant route in the United States from the Missouri River to the Columbia River country (all of which was then called Oregon). The pioneers by wagon train did not, however, fo...

Newark, cities, United States

(Encyclopedia)Newark. 1 City (1990 pop. 37,861), Alameda co., W Calif., on the east side of San Francisco Bay; inc. 1955. There is food processing and the manufacture of plastics, furniture, feeds, semiconductors, ...

Mennonites

(Encyclopedia)Mennonites mĕnˈnənīts [key], descendants of the Dutch and Swiss evangelical Anabaptists of the 16th cent. The name Mennonite is derived from Menno Simons (c.1496–1561), Dutch reformer and org...

Leibniz, Gottfried Wilhelm, Baron von

(Encyclopedia)Leibniz or Leibnitz, Gottfried Wilhelm, Baron von both: gôtˈfrēt vĭlˈhĕlm bärônˈ fan līpˈnĭts [key], 1646–1716, German philosopher and mathematician, b. Leipzig. Although known primarily...

Brooklyn

(Encyclopedia)Brooklyn bro͝okˈlĭn [key], borough of New York City (2020 pop. 2,736,074), 71 sq mi (184 sq ...

unemployment

(Encyclopedia)unemployment, condition of one who is able to work but unable to find work. Once assumed to be voluntary, idleness was punishable by law; however it is now recognized that unemployment often arises fr...

platinum

(Encyclopedia)platinum plătˈənəm [key], metallic chemical element; symbol Pt; at. no. 78; at. wt. 195.084; m.p. 1,772℃; b.p. 3,827±100℃; sp. gr. 21.45 at 20℃; valence +2 or +4. Pure platinum is a malleab...