to the sun's rotatipn. A daily period and to the poles. It is to be expected that before the actual arch, blended with blaOto rays similar to thick smoke, one equal to a tropical month (27.3 days) have also or simultaneously in many opposite points of the hori- poles are reached, the potential of… … spectroscope and a black cloth a able patches, which in their turn Antarctic auroral arc and curtain above, July 5th, 1902, 0 h. 30 m. A. M few yards distant. disappear, leaving nothing but a Auroras of the second class are trace of the dark, smoke-like seg- FORMS OF THE AURORA AUSTRALIS.…
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