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Eccentricity of the Sextant by Frederic Furbish, 1893

Eccentricity of the Sextant by Frederic Furbish, 1893, Page 37

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xyD=yDJ . JDJ' the angle measured on the graduated arc. The true angle between the stars B and C ^[is twice] this angle so we must double it. In order to obviate the necessity of doing this, each half degree on the arc is called one degree, consequently the number of degrees between the points J and J' , as read, is the true angular distance.
 
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