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Oblate and Prolate Spheroid
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Description: The shape of the earth is that of a round ball or sphere slightly flattened at two opposite sides. Such a body is termed a spheroid. There are two kinds of spheroids-oblate and prolate; the former as the shape of an orange, the latter that of a lemon. The straight line that runs through the centre of a sphere or spheroid and terminates at the circumference is called the diameter. If the sphere rotates-that is, moves around like a top-the diameter on which it turns is called the axis. In the oblate spheroid the axis is the shorter diameter; in the prolate spheroid the axis is the longer diameter.
Source: Edwin J. Houston, The Elements of Physical Geography, for the use of Schools, Academies, and Colleges. (Philadelphia: Eldredge & Brother, 1891)13
Keywords: Geography, space, planets,
Copyright: 2009, Florida Center for Instructional Technology. See license.
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