Newcomb, Simon, 1835-1909 · New York, Harper & brothers · leaf 340
308 THE SOLAR SYSTEM. … Fig. 76. — Distribution of auroras, after Loomis. The darker the color, the more frequently auroras are seen. nected with the pole of the earth is shown by the fact that its frequency depends on the latitude. In the equatorial re- gions of our globe it is quite rare, and increases in frequency as…
Astronomy
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