The heavens above: a popular handbook of astronomy (1882)
Gillet, J. A. (Joseph Anthony), 1837-1908 · New York, Chicago, Potter, Ainsworth, & Co. · leaf 208
ht be called, it hasbeen calculated that the sunmust rotate on its axis inabout twenty-five days. 185. The Inclination of theSun s Axis. — The paths de-scribed by sun-spots acrossthe solar disk vary with theposition of the earth in its, orbit, as shown in Fig. 202.VVe therefore conclude that ^ig.…
Astronomy
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