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The backstaff is a navigational instrument that was used to measure the altitude of a celestial body, in particular the Sun or Moon. When observing the Sun, users kept the Sun to their back (hence the name) and observed the shadow cast by the upper vane on a horizon vane.
The only obvious difference is the presence of horizon shades on the Crichton octant that are not on the other. Octant details showing the double-holed sighting pinnula. Also visible is the small cover that can block one or the other of the holes. The horizon mirror is on the opposite side of the instrument.
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 ...
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Geno Auriemma overall record vs. Dawn Staley: 8-5. Auriemma holds an 8-5 overall head-to-head record vs. Staley, including a 7-4 regular-season record. The 70-year-old coach took the first ...
Netflix’s new series “Apple Cider Vinegar” certainly takes aim at wellness influencers, but the Western medical system isn’t safe from criticism either.
Krispy Kreme is highlighting the tastes of the movie theater with a candy-coated twist. Available for a limited time starting Monday, Feb. 17, the popular bakery chain is partnering with Hulu to ...
American optician Thomas Godfrey (1704–1749) developed the octant about the same time in Pennsylvania. [7] [8] Also among the nautical instruments that the company of Spencer, Browning & Rust made were sextants. Developed later than the octant, in 1759, the sextant (pictured) was utilized to measure the altitude of a star or other object in ...
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