... above spoken of, do not extend to the Pole; they are indeed very unequal in extent on the meridian as well as on the equator. And the area in the northern sky not embraced in them is divided into three large spaces called Yuen or enclosures, of which the field of circumpolar stars (or circle of perpetual apparition) forms one which is called ... — The Travels of Marco Polo Volume 1 • Marco Polo and Rustichello of Pisa
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