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 68
$, .-Pit The Great Sun-spot op 1865.1. The spot entering the Suns disk, Oct. 7th (foreshortened view). 2.Its appearance, Oct. 10th. 3. Central view, Oct. 14th, showing the for-mation of a bridge, and the nucleus. 4. Its appearance, Oct. 16th. 62 THE SUN. part of the penumbra is seen sailing across…
Astronomy
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