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Moreover, the animal perceives sensible things but cannot perceive conceptual realities. For example, the animal sees that which is within the range of its vision but cannot comprehend or conceive that which lies beyond it. Thus it is not possible for the animal to comprehend that the earth has a spherical shape. But man can deduce the unknown from the known and discover hidden realities. So, for example, from observing the inclination of the heavens man infers the curvature of the earth. The Pole Star at 'Akka, for instance, is at 33 degrees; that is, it is inclined 33 degrees above the horizon. When one goes towards the North Pole, the Pole Star rises one degree above the horizon for every degree of distance travelled; that is, the inclination of the Pole Star will reach 34 degrees, then 40, 50, 60, and 70 degrees. When one reaches the North Pole, the inclination of the Pole Star will be 90 degrees and the star will be seen at the zenith, that is, directly overhead
(48:6)
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