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Updated: June 13, 2025
Kepler takes us up to the stars, which shine beautifully over the lofty Sierras, California's eternal rampart; while Lafayette speaks to us of friendship and chivalry, still alive in these matter of fact days.
The text-book which then appeared, under date of 1622, was written by the famous Kepler, who perhaps was shielded in a measure from the papal consequences of such hardihood by the fact of residence in a Protestant country.
His voice had the interest now of a man who has discerned a pretty sequence of reasoning. "Yes," he said, "Kepler with his sub-volvani was right after all." "I wish you had taken the trouble to find that out before we came," I said. He answered nothing, buzzing to himself softly, as he pursued his thoughts. My temper was going. "What do you think has become of the sphere, anyhow?" I asked.
Although Maurolycus had made some slight progress in studying the passage of light through different media, yet it is to Kepler that we owe the methods of tracing the progress of rays through transparent bodies with convex and concave surfaces, and of determining the foci of lenses, and of the relative positions of the images which they form, and the objects from which the rays proceed.
While attending the lectures of Moestlin, professor of mathematics, who had distinguished himself by an oration in favour of the Copernican system, Kepler not only became a convert to the opinions of his master, but defended them in the physical disputations of the students, and even wrote an essay on the primary motion, in order to prove that it was produced by the daily rotation of the earth.
His magnificent Observatory of Uraniborg, the finest building for astronomical purposes that the world had hitherto seen, was allowed to fall into decay, and scarcely more than mere indications of the site may now be seen. The association of Kepler with Tycho was one of the most important landmarks in the history of astronomy.
With this result Kepler was inordinately pleased, and regretted not a moment of the time spent in obtaining it, though to us this "Mysterium Cosmographicum" can only appear useless, even without the more recent additions to the known planets.
Be that as it may, the work of Kepler brought its author into no direct conflict with the authorities. But the result was quite different when, in 1632, Galileo at last broke silence and gave the world, under cover of the form of dialogue, an elaborate exposition of the Copernican theory.
Here, then, is a simple relation between the motions of swinging bodies which suggests the relation which Kepler bad discovered between the relative motions of the planets.
He sailed from Newport on the 27th of May, in the bark Kepler, having on board three companies of the Ninth Regiment of Infantry, together with Colonel Ransom, its commander, and the officers belonging to the detachment. The passage was long and tedious, with protracted calms, and so smooth a sea that a sail-boat might have performed the voyage in safety.
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