Elements of astronomy: accompanied with numerous illustrations, a colored representation of the solar, stellar, and nebular spectra, and celestial charts of the northern and the southern hemisphere (1875)
Lockyer, Norman, Sir, 1836-1920 · New York, D. Appleton and company · leaf 29
ccording to these directions. The Centre of an ellipse is the point midway betweenthe foci in the straight line that connects them, as O inFig. 10. A Diameter is a line passing through the centreand terminating at each end in the ellipse; as G H, I J. 33. What is a Semicircle ? What is a Quadrant ?… … The Major Axis of an el-lipse is its longest diameter, asGH. The Minor Axis is itsshortest diameter, as IJ. The Eccentricity of an el-lipse is the distance of eitherfocus from the centre, dividedby half the major axis. Hencethe greater the aforesaid dis-tance, the greater the eccentricity, and the…
Astronomy
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