A peculiar kind of quadrant formerly used in taking altitudes at sea, so called because the observer turned his back to the sun.
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| 单词 | θ1417 |
| 释义 | the world > the universe > cosmology > science of observation > astronomical instruments > measuring altitude > [noun] > quadrant or sextant > quadrant > types of (4) back-staff1627 A peculiar kind of quadrant formerly used in taking altitudes at sea, so called because the observer turned his back to the sun. sinical quadrant1669 a former nautical instrument having intersecting sines drawn from each side. Gunter's quadrant1679 In the name of several mathematical instruments improved or invented by Gunter. Gunter's chain: the chain of 4 poles' length now in general use… meridian quadrant1793 Astronomy. A quadrant fixed to a wall lying in the plane of the meridian; a mural quadrant. Cf. mural, adj.1 4. Now historical. |
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