Far away from this spinning and perilous globe of ours, at the distance of some 95,000,000 miles, stands the sun. A ray of light, starting from his surface at any given moment, takes eight minutes to reach us, although light runs at the speed of 195,000 miles in a second. The sun is 1,380,000 times as large as the earth, and 355,000 times as heavy; but the stuff of which he is made is just about a fourth part as dense as the average matter of this world. The sun is of as light a substance, taking his whole body, as coal; whereas the earth is twice as heavy as brimstone, striking the mean between the air, the ocean, the dry land, and the internal vapor. The sun has an atmosphere like the earth, or rather he has two. One of them, close upon his solid surface, seems to resemble our own; it bears cloudy bodies in its upper levels. The other is a sort of fiery gas, surrounding the former, kindled and sustained in the calorific and luminous state, no man knows or can conjecture how. Storms in the lower atmosphere are constantly blowing this phosphorescent airy envelope aside, so as to afford us glimpses down into the (comparatively) dark and black recesses beneath. These are the spots on the sun. Galileo inferred the rotation of the sun on his axis from the motions of those spots. The explanation of those spots, afforded by the discoveries of Wilson and Herschel, diminishes the value of the inference; but no Copernican can doubt that the sun is forever turning, and that with unimaginable swiftness and impetuosity. At the distance, then, of more than ninety-five millions of miles, this dim spot which men call earth, this great globe and all its dwellers, this ever-spinning planet, revolves around the sun once every year, that revolution being both the cause and the measure of that space of time. Its orbit is not a circle; it is an ellipse, but not very far removed from the circular path. The terrestrial axis is not at right angles to that ellipse, else there were no seasons; it is somewhat inclined. The earth, once regarded as the fixed and solid centre of creation, is now to be conceived of as a globular sphere of some fire-blown stream, bounded by a film of rock like a soap-bubble, carrying an unresting sea in the hollows of its rind, swathed in a soft gauze of air, going round upon itself every day, running round the sun every year; and all that with so much silence, security, and stillness of speed that nobody ever suspects the dread predicament of physical circumstance in which he wakes and sleeps, lives and dies, does good or evil, and passes away to judgment. It is difficult to realize the truth, now that it is told; for the knowledge of the intellect is one thing, and the consent of the whole man is quite another.