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One eighth of a circle.
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Who invented the octant?
Robert Hooke invented the octant in 1684
How many degrees in an octant?
There are 45 degrees in an octant because an octant is 1 eighth of a circle, and a circle is 360 degrees, and 45 degrees is one eighth of 360.
Who built the sextant?
John Hadley and Thomas Godfrey independently built the octant (which became the sextant later)
How did Lewis and Clark use the sextant?
Lewis and Clark did not use a sextant, instead they used what was called a "Hadley's quadrant" or octant which was a predecessor of the sextant. The octant was developed around 1730 independently by John Hadley in England and Thomas Godfrey in Philadelphia. Two others who created octants during this period were Caleb Smith in England and Jean-Paul Fouchy in France.On July 22, 1804, Lewis described the instrument, "A common octant of 14 inches radius, graduated to 20' which by means of the nonius was divisible to 1' half of this sum, or 30" was perceptible by means of a micrometer this instrument was prepared for both the fore and back observation; her error in the fore observation is 2 degrees+ & ____ and in the back observation 2 degrees II' 40.3" +."A small sighting telescope was mounted on the frame along one side. One large index mirror was mounted at the point of rotation of the index arm with a smaller horizon mirror on the frame in the line of sight. The horizon mirror allows the observer to see the image in one half of the view and to see a distant object in the other half. A pivoting shade was mounted at the vertex of the instrument to allow one to observe a bright object. By moving the index arm, the index mirror can be made to reveal any object up to 90° from the direct line of sight. When both objects are in the same view, aligning them together allows the navigator to measure the angular distance between them.
What was the piece of navigational technology did the first explorers not have at their disposal?
An early piece of navigation technology was used by the Vikings. It was a rod sticking up from a flat piece of wood. The length of the shadow of the rod indicated latitude. A later development was the octant, followed by the sextant, which was a much more accurate means of measuring lattitude. However, the most significant development was the nautical chronometer, developed by John Harrison, culminating in him being awarded a prize of £20,000 in 1773. The problem was that clocks at that time were all gravity based, and the earth's gravity is not uniform all over the planet, added to which the rolling and pitching of a ship altered the direction of gravity. Accurate adjustment of a nautical chronometer before a trip is crucial, so an observatory was established at a place called Greenwich near London. This observatory was used to observe the sun and the stars in order to establish the exact time, and every day at exact noon, a ball would slide down a rail so that all the ships anchored in the river could synchronoze their chronometers. This is the origin of the ball-drop in Times Square New York on new year midnight. This in turn led to the zero lattitude line being established passing through Greenwich, much to the annoyance of the French.
Who invented the octant?
Robert Hooke invented the octant in 1684
What year was the octant built in?
Isaac Newton invented the reflecting octant in 1699.
What is OCTANT RULE?
Octant rule is the one which is used to correlate the sign of the cotton effect.
How many degrees in an octant?
There are 45 degrees in an octant because an octant is 1 eighth of a circle, and a circle is 360 degrees, and 45 degrees is one eighth of 360.
What fraction of a circle is an octant?
An octant is 1 eighth of a circle because it is 45 degrees
What is half a octant?
Quadrant
What is half of a quadrant?
Octant
What is an octant?
One eighth of a circle.
What is half of a quadrant called?
Octant
How many degrees are there in an octant?
There is 45 degrees in an octant. This is equivalent to one eighth of a circle. Since a circle has 360 degrees you would divide this number by 8.
Words that begin with octa?
October Octagon Octave Octant
What is one eighth of a circle called?
A slice (Pie) Octant
