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 70
led ridges pass in various directions.i 20. Other Appearances on the Suns Disk.—The wholesurface of the Sun, except those portions occupied by thespots, is coarsely mottled; and, in-deed, the mottledappearance requiresno very great opti-cal power to renderit visible. Viewedthrough a large… … Fig. 29.— Willow-leaves in a Sun-spot. A,tongue of facula stretching out into the umbra.B, clouds. C, layers of willow-leaves in thepenumbra. willow-leaves has been appropriately applied to appear-ances sometimes observed in the penumbrae of spots.They consist of elongated masses of unequal…
Astronomy
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
