Elements of astronomy: accompanied with numerous illustrations, a colored representation of the solar, stellar, and nebular spectra, and celestial charts of the northern and the southern hemisphere (1875)
Lockyer, Norman, Sir, 1836-1920 · New York, D. Appleton and company · leaf 64
pots always make their first appearance on the same sideof the Sun; that they travel across it in from twelve anda half to fourteen days, and then disappear on the otherside. This is not all: if they be observed in June, theygo straight across the suns disk with a dip downward; ifin September, they… … Fig. 21.—Apparent Paths of the Spots across the Suns Disk, as seenfrom the Earth at different times of the year. The arrows show thedirection in which the Sun rotates. 111. The Plane of the Ecliptic.—It is important that ference between volume and mass ? How does the Sun compare with the Earthin…
Astronomy
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