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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...

Defregger, Franz von

(Encyclopedia)Defregger, Franz von fränts fən dāˈfrĕgər [key], 1835–1921, Austrian genre and historical painter. He studied in Munich with Piloty. He is known for his popular pictures of Tyrolean life, whic...

Winterhalter, Franz Xaver

(Encyclopedia)Winterhalter, Franz Xaver fränts ksävârˈ vĭnˈtərhälˌtər [key], 1806–73, German portrait painter. Most of European royalty sat for him, and his decorative pictures of court figures are in l...

Empedocles

(Encyclopedia)Empedocles ĕmpĕdˈəklēz [key], c.495–c.435 b.c., Greek philosopher, b. Acragas (present Agrigento), Sicily. Leader of the democratic faction in his native city, he was offered the crown, which h...

hearts

(Encyclopedia)hearts, card game played by three to six players with an ordinary deck. All the cards are dealt to the players. After a card is led, each hand must follow suit if possible. The object is to avoid accu...

Sagua la Grande

(Encyclopedia)Sagua la Grande säˈgwä lä gränˈdā [key], city (1984 pop. 50,000), Villa Clara prov., central Cuba, on the Sagua la Grande River. It is a road and rail hub and the commercial and processing cent...

Ronda

(Encyclopedia)Ronda rônˈdä [key], town (1990 pop. 34,102), Málaga prov., S Spain, in Andalusia. One of the most colorful of Spanish towns, it is beautifully situated high in the mountains of Sierra de Ronda and...

Chavín de Huántar

(Encyclopedia)Chavín de Huántar chävēnˈ dā wänˈtär [key], archaeological site in the northeastern highlands of Peru, near the headwaters of the Marañon River. It flourished between c.900 b.c. and 200 b.c....

Burbank

(Encyclopedia)Burbank, city (2020 pop.107,337), Los Angeles co., S Calif.; inc. 1911. Tourism and the entertainment industry are central to its economy; several motio...

De Forest, Lee

(Encyclopedia)De Forest, Lee, 1873–1961, American inventor, b. Council Bluffs, Iowa, grad. Yale, 1896. He was a pioneer in the development of wireless telegraphy, sound pictures, and television. His triode (1906)...