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Then she opened her eyes and they fell full upon the factor, his light head bared to the dancing sun-spots, his blue eyes sober and touched again with that anxiety which had compelled her to take his gift. There was no sudden start of fear, no little startled breath, for this woman was calm as the dreaming woods and as serene.
A final answer to this question cannot yet be given, for the evidence is contradictory, and the interpretations put upon it depend largely on the predilections of the judges. But, in a broad sense, the sun-spots and the phenomena connected with them must have a relation to terrestial meteorology, for they prove the sun to be a variable star.
The temperature of the interior of the Astronef began to rise as soon as the upper cloud-belt was passed. Under this, spread out a vast field of brown-red cloud, rent here and there into holes and gaps like those storm-cavities in the atmosphere of the Sun, which are commonly known as sun-spots.
The multiple aspect and somewhat variable character of both bright and dark lines were plausibly referred to processes of "reversal," such as are nearly always in progress above sun-spots; but the long duration of the star's suddenly acquired lustre did not easily fit in with the adopted rationale.
We can only infer that the forms of sun-spots are really more various than had been supposed; that they are peculiarly subject to disturbance; and that the level of the nuclei may rise and fall during the phases of commotion, like lavas within volcanic craters.
The same inquirer has more recently detected both for auroræ and sun-spots a "secular period" of 222 years, and the Kew observations indicate for the latter, oscillations accomplished within twenty-six and twenty-four days, depending, most likely, upon the rotation of the sun. This is certainly reflected in magnetic, and perhaps in auroral periodicity.
I had been looking all winter across the Campagna at the free-flowing outline of the Alban Mount, with its half-dozen towns shining on its purple side even as vague sun-spots in the shadow of a cloud, and thinking it simply an agreeable incident in the varied background of Rome. But now that during the last few days I have been treating it as a foreground, have been suffering St.
So with wind and calm, rain and drought, and so forth. Always, whether the sun is very much spotted or quite free from spots, something unusual in the way of weather must be going on somewhere, demonstrating in the most significant way the influence of sun-spots or the want of sun-spots on the weather.
But the correspondence indicated is not, as has often been hastily assumed, between maxima of sun-spots and minima of stellar brightness, but just the reverse. The luminous outbursts, not the obscurations of variable stars, obey a law analogous to that governing the development of spots on the sun.
So slight a change would not be perceptible; but it is not alone sun-spots which obscure the solar surface, its entire globe is enveloped with an obscuring veil.
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