A beginner's star-book; an easy guide to the stars and to the astronomical uses of the opera-glass, the field-glass and the telescope (1912)
Murphy, Edgar Gardner, 1869-1913 · New York, London, G.P. Putnam's Sons · leaf 79
of the 66 a ISeoinners Star*J5ool? As we note the course of the sun-spots, we seldom find them exactly at the Suns equatoror near the poles. They are usually seen in the regions lying midway between the polesand the equator, coming into view at the eastern limb (our left as we face… … FIG. 8. THE DISK OF THE SUN Comparison of direct photograph, at readers right. Uith high-level spectroheliogram, on leftFrom negatives made at the Yerkes Observatory absence) reappearing at the eastern limb. We can thus prove to our own satisfactionthat the Sun rotates on its axis, as does the…
Astronomy
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