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It is a remarkable circumstance in the history of science, that astronomy should have been cultivated at the same time by three such distinguished men as Tycho, Kepler, and Galileo.
To appreciate the relations of Kepler and Tycho it is necessary to note the very different way in which these illustrious astronomers viewed the system of the heavens. It should be observed that Copernicus had already expounded the true system, which located the sun at the centre of the planetary system. But in the days of Tycho Brahe this doctrine had not as yet commanded universal assent.
We climbed the Strahow, inspected the monastery that crowns its summit, admired the fine library, and gazed with reverence on the autograph of Tycho Brahe; we wandered round the ramparts; we surveyed the field of the battle of Prague; we examined more minutely the ground on which Ziska had fought and conquered; we left nothing unexplored, in short, which we found that it was possible to bring within the scope of general observation; nor permitted any matter, concerning which curiosity had been excited, to pass without investigation.
What of that radiant unknown element upon the moon mount Tycho? What of that element unknown to us as part of earth which is seen only in the corona of the sun at eclipse that we call coronium? Yet the earth is child of the sun as the moon is earth's daughter.
There may, further, be cases where the effects of luminous radiative repulsion become apparent, and also Crookes' vacuum-effects described as "radiant matter." Nor is it quite certain that Laplace's proofs of the instantaneous propagation of gravity are final. And in the future, as in the past, Tycho Brahe's dictum must be maintained, that all theory shall be preceded by accurate observations.
In 1875 the writer saw and photographed, on that part of the wall of Peking used by the Mandarins as an observatory, the six instruments handsomely designed by Father Verbiest, copied from the instruments of Tycho Brahe, and embellished with Chinese dragons and emblems cast on the supports.
But, independent of this apology, his subsequent conduct was so truly noble as to reconcile even Tycho to his penitent friend.
King Frederick, in consideration of various grants to Tycho, relied upon his assistance in scientific matters, and especially in astrological calculations; such as the horoscope of the heir apparent, Prince Christian, born in 1577, which has been preserved among Tycho's writings.
Yet, without the ellipse, without the conic sections of Plato and Apollonius, astronomy would have been to this day a sealed science, and the labors of Hipparchus, Ptolemy, Tycho, and Copernicus would have waited in vain for the genius of Kepler and of Newton to educe divine order from the seeming chaos of motions. But the obligations of man to the ellipse do not end here.
Tycho received this lecture in good temper, and with the anxious expectation that a clear sky would enable him to give a practical refutation of the attack which was made upon his country. The night turned out serene, and the whole party saw with astonishment the new star under the most favourable circumstances.
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