Moulton, Forest Ray, 1872-1952 · New York, The Macmillan company · leaf 69
that they are even more stable than the correspond-ing homogeneous figures. 17. Different Kinds of Latitude. — It was seen in Art.12 that perpendiculars to the water-level surface of theearth, except on the equator and at the poles, do not passthrough the center of the earth. This leads to the… … occupied by the observer. Thus, in Fig. 13, PC is the earthsaxis of rotation, QC is in the plane of its equator, and 0 isthe position of the observer. The angle I is called the geo-centric latitude. The observer at 0 cannot see the center of the earth andcannot locate it by any kind of observation…
Astronomy
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