Newcomb, Simon, 1835-1909, Holden, Edward Singleton, 1846-1914, joint author · New York, H. Holt · leaf 35
rnal motion is caused by a daily revolution ofthe earth on an axis passing through its centre, called theaxis of the earth. This axis intersects the earth at twoopposite poles called the north and south poles of theearth. If the earths axis be continued indefinitely in both diree- 16 ASTRONOMY.… … Fig. 5. The Earths Axis and the Plane of the Equator — N P, the North Pole; SP,the Sonth Pole ; E Q, plane of the Equator ; e q, the terrestrial Equator. The plane E Q, passing through the centre of the earthat right angles to the axis, is called the plane of theequator. The plane of the equator…
Astronomy
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