A new manual of the elements of astronomy, descriptive and mathematical .. (1868)
Kiddle, Henry, 1824-1891 · New York, Ivison, Phinney, Blakeman & co.; Chicago, S.C. Griggs & co. · leaf 110
of the axis is exaggerated in thediagram.] 153. Appearance of the Spots.—When the spots areexamined by means of a telescope, they present the appear-ance of irregular black patches surrounded with a duskyborder or fringe, the whole sometimes encompassed with abright surface or ridge. The black…
Astronomy
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