A high-school astronomy: in which the descriptive, physical, and practical are combined .. (1859)
Mattison, Hiram, 1811-1868 · New York, Mason brothers · leaf 152
rrepa-rably injured. 314. The solar spots are all found within a zone 60°wide—i. <?., 30° each side of the suns equator. They aregenerally permanent, though they have been known to 313. View of suns surface through telescopes ? Number of spots seen ?Are they always to be seen? How from 1611 to… … 148 ASTRONOMY. break in pieces, and disappear in a very short time.They sometimes break out again in the same places, orwhere none were perceptible before. They pass fromleft to right over the suns disk in 13 days, 15 hours,and 45 minutes ; from which it has been ascertained thathe performs a…
Astronomy
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