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O que (quem) é quadrants$528845$ - definição
WIKIMEDIA DISAMBIGUATION PAGE
Quadrants; Quadrant (technology); Circular quadrant; Quadrant (disambiguation); Quadrent
Quadrant (instrument)
![A large frame quadrant at the [[Beijing Ancient Observatory]]. It was constructed in 1673.](https://commons.wikimedia.org/wiki/Special:FilePath/Ancient Beijing observatory 14.jpg?width=200 "A large frame quadrant at the [[Beijing Ancient Observatory]]. It was constructed in 1673.")
![Horary quadrant for a latitude of about 51.5° as depicted in an instructional text of 1744: ''To find the Hour of the Day: Lay the thread just upon the Day of the Month, then hold it till you slip the small Bead or Pin-head'' [along the thread] ''to rest on one of the 12 o'Clock Lines; then let the Sun shine from the Sight G to the other at D, the Plummet hanging at liberty, the Bead will rest on the Hour of the Day.''](https://commons.wikimedia.org/wiki/Special:FilePath/Horary-quadrant.jpg?width=200 "Horary quadrant for a latitude of about 51.5° as depicted in an instructional text of 1744: ''To find the Hour of the Day: Lay the thread just upon the Day of the Month, then hold it till you slip the small Bead or Pin-head'' [along the thread] ''to rest on one of the 12 o'Clock Lines; then let the Sun shine from the Sight G to the other at D, the Plummet hanging at liberty, the Bead will rest on the Hour of the Day.''")
![[[Ptolemy]] using a quadrant](https://commons.wikimedia.org/wiki/Special:FilePath/Ptolemy Astrology 1564.jpg?width=200 "[[Ptolemy]] using a quadrant")
![Engraving of [[Tycho Brahe]]'s [[Mural quadrant]] in [[Uraniborg]] in 1598, picturing the two clocks.](https://commons.wikimedia.org/wiki/Special:FilePath/Tycho-Brahe-Mural-Quadrant.jpg?width=200 "Engraving of [[Tycho Brahe]]'s [[Mural quadrant]] in [[Uraniborg]] in 1598, picturing the two clocks.")
NAVIGATION INSTRUMENT
Mariner's quadrant; Surveyor's quadrants
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.
Quadrant
·noun The fourth part; the quarter.
II. Quadrant ·noun The quarter of a circle, or of the circumference of a circle, an arc of 90°, or one subtending a right angle at the center.
III. Quadrant ·noun One of the four parts into which a plane is divided by the coordinate axes. The upper right-hand part is the first quadrant; the upper left-hand part the second; the lower left-hand part the third; and the lower right-hand part the fourth quadrant.
IV. Quadrant ·noun An instrument for measuring altitudes, variously constructed and mounted for different specific uses in astronomy, surveying, gunnery, ·etc., consisting commonly of a graduated arc of 90°, with an index or vernier, and either plain or telescopic sights, and usually having a plumb line or spirit level for fixing the vertical or horizontal direction.
Quadrant
A length equal to an approximate earth quadrant, equal to 1E9
centimeters. It has been used as the name for the unit of inductance,
the henry, q. v.
Synonym--Standard Quadrant.
