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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°), [3] 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 [4] span sectors of approximately 1 ⁄ 8 of a circle (45°), 1 ⁄ 5 of a circle (72 ...
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 ...
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).
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The variant of HO-229: Sight Reduction Tables for Small Boat Navigation, known as Schlereth, 1983, 1 volume) H.O. 214 (Tables of Computed Altitude and Azimuth, H.D. 486 in the UK, 1936–46, 9 vol.) H.O. 211 (Dead Reckoning Altitude and Azimuth Table, known as Ageton, 1931, 36pg.
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The arcs are so small that magnifiers are attached to allow them to be read. [7] In addition to these types, there are terms used for various sextants. A pillar sextant can be either: A double-frame sextant as patented by Edward Troughton in 1788. A surveyor's sextant with a socket for a surveyor's staff (the pillar). [10]
Sextans A (also known as UGCA 205) is a small dwarf irregular galaxy.It spans about 5000 light-years across, and is located at 4.3 million light-years away, in the outskirts of the Local Group of galaxies, which includes the Milky Way galaxy, and to which Sextans A may or may not belong.
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