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cycle

(Encyclopedia)cycle, in astronomy, period of time required for the recurrence of some celestial event. The length of a cycle may be measured relative to the sun or to the fixed stars (see sidereal time). A frequent...

gyroscope

(Encyclopedia)CE5 Three-frame gyroscope gyroscope jīˈrəskōpˌ [key], symmetrical mass, usually a wheel, mounted so that it can spin about an axis in any direction. When spinning, the gyroscope has special p...

Egyptians, Gospel of the

(Encyclopedia)Egyptians, Gospel of the: see Pseudepigrapha. ...

duplication of the cube

(Encyclopedia)duplication of the cube: see geometric problems of antiquity. ...

Dells of the Wisconsin

(Encyclopedia)Dells of the Wisconsin, The Dells, or The Wisconsin Dells, scenic part of the Wisconsin River, central Wis., NW of Portage. The river has cut a deep gorge through 8 mi (12.9 km) of sandstone, which i...

Doctors of the Church

(Encyclopedia)Doctors of the Church: see Fathers of the Church. ...

Dome of the Rock

(Encyclopedia)Dome of the Rock: see Islamic art and architecture. ...

Dunes, Battle of the

(Encyclopedia)Dunes, Battle of the, 1658, decisive engagement fought near Dunkirk in the struggle between France and Spain that had resulted from Spanish intervention in the Fronde. The Spanish under the command of...

Confederation of the Rhine

(Encyclopedia)Confederation of the Rhine, league of German states formed by Emperor Napoleon I in 1806 after his defeat of the Austrians at Austerlitz. Among its members were the newly created kingdoms of Bavaria a...

Congo, kingdom of the

(Encyclopedia)Congo, kingdom of the: see Kongo, kingdom of. ...