A short course in astronomy and the use of the globes (1871)
Kiddle, Henry, 1824-1891 · New York, Chicago, Ivison, Blakeman, Taylor & co. · leaf 16
of eccentricity of any ellipse is ascertainedby comparing it with one-half the major axis. Thus, in the dia-gram, O F being about one-half of O D, the eccentricity of theellipse may be nearly expressed by .5. 29. A Sphere, or Globe, is a round body every pointof the surface of which is equally… … 31. The Diameter of a sphere is a straight linedrawn through the centre, and pnrrterminated both ways by thesurface of the sphere. 32. TJie Radius of a sphereis a straight line drawn fromthe centre to any point of thesurface. 33. Circles drawn on the sur-face of a sphere are either GreatCircles or…
Astronomy
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