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Sextant


A sextant is a navigational instrument used to measure the angle between two visible objects, most commonly between the horizon and a celestial body like the sun, moon, or stars. It helps sailors determine their latitude and longitude while at sea, making it essential for marine navigation before the age of GPS.


The sextant consists of a frame with a graduated arc marked in degrees, a movable arm called an index arm, and mirrors to sight the objects. By measuring the angle accurately, navigators can calculate their position on the Earth’s surface using mathematical tables.


Invented in the 18th century, the sextant revolutionized navigation by allowing more precise and reliable open-sea travel. Even today, it remains a valuable backup tool for sailors and navigators.


– Mil


Sure! Here's a short note on Quadrant, signed as Mil:




Quadrant


A quadrant is one of the four equal parts of a plane divided by a horizontal axis (x-axis) and a vertical axis (y-axis), commonly used in the Cartesian coordinate system in mathematics. These four regions are numbered counterclockwise:



  • Quadrant I: Both x and y are positive



  • Quadrant II: x is negative, y is positive



  • Quadrant III: Both x and y are negative



  • Quadrant IV: x is positive, y is negative



Quadrants help in locating and plotting points, analyzing graphs, and understanding geometric shapes in coordinate geometry. They are also useful in fields like physics, engineering, and computer graphics for mapping positions and directions.


Beyond math, the term "quadrant" can be used to describe any one-fourth division of a circular area or space.


– Mil




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