Moulton, Forest Ray, 1872-1952 · New York, The Macmillan company · leaf 112
the earth would be sphericalif it were not rotating. Since it is not spherical, it must berotating. Moreover, it follows from the laws of motionthat if it is rotating it will be bulged at the equator. Hencethe oblateness of the earth proves that it rotates and deter-mines the position of its axis,… … Fig. 27. — The eastward deviation of falling bodiesproves the eastward rotation of the earth. tower from whose top a ball is dropped. Suppose that whilethe ball is falling to the foot of the tower the earth rotatesthrough the angle QEQ. The top of the tower is carriedfrom P to P, and its foot from…
Astronomy
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