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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]
John Bird (1709– 31 March 1776) was a British mathematical instrument maker who was notable for inventing the sextant. [citation needed] He came to London in 1740 where he worked for Jonathan Sisson and George Graham. [1] By 1745, he had his own business in the Strand.
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).
For You: How To Start Investing In real estate — Even If You’re Not Rich. Of course, buying real estate is a major decision, so you’ll need to conduct plenty of research. Some factors to ...
NEW YORK (Reuters) -Wall Street banks are getting ready to sell up to $3 billion of debt holdings in X, the social-media platform controlled by Elon Musk, two people with knowledge of the matter ...
An astronomical instrument is a device for observing, measuring or recording astronomical data.They are used in the scientific field of astronomy, a natural science that studies celestial objects and the phenomena that occur in the cosmos, with the object of explaining their origin and evolution over time.
Investigators interviewed more than 40 women who accused Tal, Oren and Alon Alexander of sex crimes. Alleged victims recounted the attacks in new footage released by prosecutors.
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