Howe, Herbert A. (Herbert Alonzo), 1858-1926 · Meadville, Penna., Flood and Vincent · leaf 191
9&»L 2+ it** v\*# 4?«*\\ Fig. 92.—Changes in a Solar Spot.covering thousands of millions of square miles. One ofArourgeSpot ^e largeSL spot-groups on record had a diameter of150,000 miles. The central spot of a large group, The Sun. 185 which appeared in February, 1892, measured 100,000miles by…
Astronomy
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