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A dome is a feature in structural geology where a circular part of the Earth's surface has been pushed upward, tilting the pre-existing layers of earth away from the center. In technical terms, it consists of symmetrical anticlines that intersect each other at their respective apices .
The dome of the Great Mosque of Kairouan (also called the Mosque of Uqba), built in the first half of the 9th century, has ribbed domes at each end of its central nave. The dome in front of the mihrab rests on an octagonal drum with slightly concave sides. [47] [48] The Great Mosque of Sfax in Tunisia was founded in the 9th century and later ...
In the case of the simple dome, the pendentives are part of the same sphere as the dome itself; however, such domes are rare. [8] In the case of the more common compound dome, the pendentives are part of the surface of a larger sphere below that of the dome itself and form a circular base for either the dome or a drum section. [7]
Facade of the Pantheon, Rome. By far the most famous roofed round Roman building is the Pantheon, Rome.However this sharply differs from other classical tholoi in that it is entered though a very large flat temple front with a projecting portico with three rows of columns, while the rest of the exterior is a blank wall without columns or windows, so the circular form is rather obscured from ...
In architecture, a pendentive is a constructional device permitting the placing of a circular dome over a square room or of an elliptical dome over a rectangular room. [1] The pendentives, which are triangular segments of a sphere, taper to points at the bottom and spread at the top to establish the continuous circular or elliptical base needed for a dome. [2]
A large dome was built in 1881–1882 over the circular courtyard of the Devonshire Royal Hospital in England with a diameter of 156 feet. [47] It used radial trussed ribs with no diagonal ties. [41] The dome of Pavia Cathedral, a building started in 1488, was completed with a large octagonal dome joined to the basilica plan of the church. [48]
The apparent lightness of its dome may be attributed to both even lighting and the unusual lack of pendentives, with the dome on its circular entablature above eight columns instead. [158] Its use of bulbous domes on the lantern and side towers was also unusual in Italy, where bulbous domes remained rare. [94]
An oculus (from Latin oculus 'eye'; pl.: oculi) is a circular opening in the center of a dome or in a wall. Originating in classical architecture, it is a feature of Byzantine and Neoclassical architecture. A horizontal oculus in the center of a dome is also called opaion (from Ancient Greek ὀπαῖον '(smoke) hole'; pl.: opaia).