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A mural instrument is an angle measuring instrument mounted on or built into a wall. For astronomical purposes, these walls were oriented so they lie precisely on the meridian. A mural instrument that measured angles from 0 to 90 degrees was called a mural quadrant. They were utilized as astronomical devices in ancient Egypt and ancient Greece.
A quadrant is an instrument used to measure angles up to 90°. Different versions of this instrument could be used to calculate various readings, such as longitude , latitude , and time of day . Its earliest recorded usage was in ancient India in Rigvedic times by Rishi Atri to observe a solar eclipse.
The quadrant curve was a feature popularised by Andrea Palladio, who used it often for the wings and colonnades which linked his classical style villas to their service wings and outbuildings. However, curved quadrant buildings should not be confused with the canted facades of Baroque architecture or the slightly curved buildings of the era ...
Romanesque rib vaulting, Peterborough Cathedral (begun 1118) south aisle Gothic rib vaulting, Reims Cathedral (begun 1221) nave A rib vault or ribbed vault is an architectural feature for covering a wide space, such as a church nave, composed of a framework of crossed or diagonal arched ribs.
The specific types of embellishments utilized in orosi typically linked the windows to the patron's social and political eminence. The more ornate a window is, the higher social and economic status the owner is more likely to have. A good example of this is Azad Koliji, a Dowlatabad Garden in Iran [citation needed]. The girih patterns on its ...
An Elton's quadrant is a derivative of the Davis quadrant. It adds an index arm and artificial horizon to the instrument, and was invented by English sea captain John Elton , who patented his design in 1728 and published details of the instrument in the Philosophical Transactions of the Royal Society in 1732.
3D visualization of a sphere and a rotation about an Euler axis (^) by an angle of In 3-dimensional space, according to Euler's rotation theorem, any rotation or sequence of rotations of a rigid body or coordinate system about a fixed point is equivalent to a single rotation by a given angle about a fixed axis (called the Euler axis) that runs through the fixed point. [6]
The largest example is the equinoctial sundial belonging to Jaipur's assembly of instruments, consisting of a gigantic triangular gnomon with the hypotenuse parallel to the Earth's axis. On either side of the gnomon is a quadrant of a circle, parallel to the plane of the equator .