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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.
In navigation the instrument is also called a cross-staff and was used to determine angles, for instance the angle between the horizon and Polaris or the sun to determine a vessel's latitude, or the angle between the top and bottom of an object to determine the distance to said object if its height is known, or the height of the object if its distance is known, or the horizontal angle between ...
It was replaced by the back staff and later by the octant and sextant. Quadrant A very simple instrument which used a plumb bob. These instruments are also used to measure the angular distance between objects: Octant, invented in 1731. The first widely accepted instrument that could measure an angle without being strongly affected by movement.
Only one camera was recording the action and only one tape exists of that game. As Daly called time on the scrimmage, the scoreboard confirmed the shocking result – Dream Team 54-62 Select Team.
The name octant derives from the Latin octans meaning eighth part of a circle, because the instrument's arc is one eighth of a circle.. Reflecting quadrant derives from the instrument using mirrors to reflect the path of light to the observer and, in doing so, doubles the angle measured.
WASHINGTON (Reuters) -The U.S. Transportation Security Administration said its 65,000-member workforce is exempt from a Trump administration offer to quit jobs in exchange for pay and benefits ...
$1.39 at amazon.com. Whole Flax Seed. Vegans know all about “flax egg.” But for the unfamiliar, you can turn these seeds into a thickener used for baking in the same way you’d use an actual egg.
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 ...