Kitap 2
5.5
Let it be supposed that the earth and sea together form a spheroidal body, and preserve one and the same level in all the seas. For though some portions of the earth may be higher, yet this bears so small a relation to the size of the whole mass, as need not be noticed. The spheroid in consequence is not so minutely exact as one might be made by the aid of a turner’s instrument, or as would answer the definition of a geometer, still in general appearance, and looked at roughly, it is a spheroid. Let the earth be supposed to consist of five zones, with (1.) the equatorial circle described round it, (2.) another parallel to this,Strabo supposed this circle at a distance of 38,100 stadia from the equator, or 54° 25′ 42″ or latitude. and defining the frigid zone of the northern hemisphere, and (3.) a circle passing through the poles, and cutting the two preceding circles at right angles. The northern hemisphere contains two quarters of the earth, which are bounded by the equator and the circle passing through the poles.
