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The frame of a sextant is in the shape of a sector which is approximately 1 ⁄ 6 of a circle (60°), [2] hence its name (sextāns, sextantis is the Latin word for "one sixth"). "). Both smaller and larger instruments are (or were) in use: the octant, quintant (or pentant) and the (doubly reflecting) quadrant [3] span sectors of approximately 1 ⁄ 8 of a circle (45°), 1 ⁄ 5 of a circle (72 ...
Spencer, Browning & Rust quintant sextant or lattice sextant at the United States Geological Survey Museum. One of the oldest items in the collection of the United States Geological Survey Museum is a quintant sextant or lattice sextant (pictured) that was manufactured by Spencer, Browning & Rust. The sextant dates from the 1820s to 1850s. [9]
The first known mural sextant was constructed in Ray, Iran, by Abu-Mahmud al-Khujandi in 994. [1] To measure the obliquity of the ecliptic, al-Khujandī invented a device that he called al-Fakhri sextant (al-suds al Fakhrī), a reference to his patron, Buwayhid ruler, Fakhr al Dawla (976–997).
In the 1950s the company started producing optical encoders. During the Cold war era, Gurley manufactured gyroscopes, sextants, star trackers, theodolites, angle dividers, optical positioning systems, and various other precision guidance devices for guided missiles and for space launch vehicles. [1]
The Bris sextant / ˈ b r iː s /, or Bris Mini-Sextant, is not a sextant proper, but is a small angle-measuring device that can be used for navigation. [ 1 ] [ 2 ] The Bris is, however, a true reflecting instrument which derives its high accuracy from the same principle of double reflection which is fundamental to the octant, the true sextant ...
Video footage and pictures from the Oval Office show President Donald Trump signing off executive orders with a thick, black Sharpie.
Mk VIII Bubble sextant in use on a Short Sunderland. Isaac Newton developed the quadrant. The octant was a further improvement. It could measure altitudes of up to 90° above the horizon. The first bubble instruments, which were developed by Gago Coutinho, were bubble sextants that copied the features of an ordinary sextant.
Humans love it when cats knead because the cute motion makes it look like cats are hard at work on a bakery assembly line.
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