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 69
ands of square miles of theSuns surface, which took place in the great sun-spot of1865, are represented in the diagrams on page 61. l i 9. Faculse.—Near the edge of the solar disk, and es-pecially about spots approaching the edge, it is quite easy,even with a small telescope, to discern certain… … Fig. 28.—Sun-spots and Faculse. P/om a Photograph. termed JFhculce, are the most brilliant parts of the Sun.Where, near the edge, the spots become invisible, undu-lated shining ridges still indicate their place—being moreremarkable there than elsewhere, though everywheretraceable in good observing…
Astronomy
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