Galileo Galilei

“ I Galileo Galilei, son of the late Vincenzo Galilei, of Florence, aged 70 years, being brought personally to judgment, and kneeling before you, Most Eminent and Most Reverend Lords Cardinals, General Inquisitors of the universal Christian republic against heretical depravity, having before my eyes the Holy Gospels, which I touch with my own hands, swear, that I have always believed, and now believe, and with the help of God will in future believe, every article which the Holy Catholic and Apostolic Church of Rome holds, teaches, and preaches. ”

“ While Kepler was solving these riddles of planetary motion, there was an even more famous man in Italy whose championship of the Copernican doctrine was destined to give the greatest possible publicity to the new ideas. This was Galileo Galilei, one of the most extraordinary scientific observers of any age. Galileo was born at Pisa, on the 18th of February (old style) , 1564. The day of his birth is doubly memorable, since on the same day the greatest Italian of the preceding epoch, Michael Angelo, breathed his last. ”

“ The 'Elogio del Galileo' by Paolo Frisi, first published at Leghorn in 1775, is, as its title expresses, rather in the nature of a panegyric than of a continuous biographical account. It is written with very great elegance and intimate knowledge of the subjects of which it treats. Nelli gave several curious particulars with respect to Galileo in his 'Saggio di Storia Letteraria Fiorentina, Lucca, 1759;' and in 1793 published his large work entitled 'Vita e Commercio Letterario di Galileo Galilei.' So uninteresting a book was probably never written from such excellent materials. ”

“ During the time of his professorship at Pisa he made his grand researches into the laws of gravitation, now known under the name of "Galileo's Laws," and wrote as the result of them his great treatise "De Motu Gravium." It then had but a limited circulation in copies, and did not appear in print until two hundred years after his death, in Albèri's "Opere complete di Galileo Galilei." Aristotle, nearly two thousand years before, had raised the statement to the rank of a proposition, that the rate at which a body falls depends on its weight. ”

“ Whatever may be our judgment of his candour, we may at least feel assured that if this had indeed been a fair specimen of Galileo's philosophy, he might to the end of his life have taught that the earth moved round the sun, or if his fancy led him to a different hypothesis, he might like the Abbé Baliani have sent the earth spinning round the stationary moon, and like him have remained unmolested by pontifical censures. ”

“ When Galileo’s father learnt that his son was devoting himself to Euclid at the expense of Hippocrates and Galen, he did his utmost to divert him from this new, and as it seemed to him, unprofitable study. The science of mathematics was not then held in much esteem, as it led to nothing practical. Its use, as applied to the laws of nature, had scarcely begun to be recognised. But the world-wide mission for which Galileo’s genius destined him had been too imperiously marked out by fate for him to be held back by the mere will of any man. ”

“ Scartazzini alone that the odium of the accusation rests; in the annals of history, the name of Niccolini stands untarnished, and every Italian, every educated man, will think with gratitude of the man who nobly and disinterestedly stood by the side of Galileo Galilei at the time of his greatest peril. Honour be for ever to his memory!
We give, in conclusion, one more instance of a curious kind of evidence that Galileo really was subjected to torture. ”

“ Galileo Galilei was getting to be more than a professor of mathematics—he was becoming a power in the world.
The lever of his mighty mind was indeed finding a fulcrum. [Pg 68]
he year Sixteen Hundred Nine is forever fixed in history, through the fact that in that year Galileo invented the telescope.
Every good thing is an evolution. ”

“ Galileo's glass taught him to believe that the surface of this planet, far from being smooth and polished, as was generally taken for granted, really resembled our earth in its structure; he was able distinctly to trace on it the outlines of mountains and other inequalities, the summits of which reflected the rays of the sun before these reached the lower parts, and the sides of which, turned from his beams, lay buried in deep shadow. ”

“ But having been often and often convinced by experience of the tricks fate plays me, I can but expect from its obstinate perfidy, that what would be an advantage to any one else will never bring anything but harm to me. But even in this bitter adversity I do not lose my peace of mind, for it would be but idle audacity to oppose inexorable destiny." [41] Galileo, who thought his hours were numbered, dictated his will on 21st August, in the presence of a notary and witnesses, and directed that he should be buried in the family vault of the Galilei in the Church of Santa Croce at Florence. ”

“ Castelli eagerly seized the opportunity of applauding Galileo's splendid discovery. Boscaglia, a Peripatetic of the purest water, could not master his displeasure, and whispered meanwhile to the Grand Ducal mother that all Galileo's telescopic discoveries were in accord with the truth, only the double motion of the earth seemed incredible, nay impossible, as the Holy Scriptures were clearly opposed to it. ”

“ For the sake of Galileo's moral greatness, his submission may be regretted, but at all events greater benefit has accrued from it to science, than if, in consequence of a noble steadfastness which we should have greeted with enthusiasm, he had perished prematurely at the stake or had languished in the dungeons of the Inquisition. ”

“ Article Galilée.
*Berti (Prof. Domenico) : “La venuta di Galileo Galilei a Padova. Studii. Atti del Reale Istituto Veneto di scienze, lettere ed arti, dal Novembre 1870 all’ ottobre 1871.” Tomo decimosesto, seria terza, dispensa quinta, ottava, nono e decima. Venezia, 1870, 1871.
*“Copernico e le vicende del Sistema Copernicano in Italia nella seconda metà del secolo XVI. e nella prima del secolo XVII.” Roma, 1876.
“Il Processo originale di Galileo Galilei, pubblicato per la prima volta.” ”

“ The Pope, wishing to give a strong official proof of his favour, had himself addressed a letter to the Grand Duke of Tuscany, in which, to the no small chagrin of Galileo's enemies, he had not only done full justice to his services to science, but had laid special stress on his religious sentiments. In this letter of 7th June, 1624, Urban first mentioned Galileo's great discoveries, "the fame of which will shine on earth so long as Jupiter and his satellites shine in heaven." ”

“ Galileo proved on the contrary that the reception of a fresh impulse in no way interfered with the movement already impressed, and that the rotation of the earth was insensible, because shared equally by all bodies at its surface. His theory of the inclined plane, combined with his satisfactory definition of “momentum,” led him towards the third law of motion. We find Newton’s theorem, that “action and reaction are equal and opposite,” stated with approximate precision in his treatise Della scienza meccanica, which contains the substance of lectures delivered during his professorship at Padua ”

“ The complaint in Galileo's eyes grew rapidly worse. By the end of June the sight of the right eye was gone, and that of the other diminished with frightful rapidity from a constant discharge. [10] But in spite of this heavy calamity, combined with his other sufferings, his interest in science did not diminish for a moment. Even at this sad time we find him carrying on a brisk correspondence with the learned men of Germany, Holland, France, and Italy, continuing his negotiations with the States-General with great zest, [11] as well as occupying himself perpetually with astronomy and physics. ”

“ From the time of Archimedes there had existed a science of equilibrium, but the science of motion began with Galileo. It is not too much to say that the final triumph of the Copernican system was due in larger measure to his labours in this department than to his direct arguments in its favour. The problem of the heavens is essentially a mechanical one; and without the mechanical conceptions of the dependence of motion upon force which Galileo familiarized to men’s minds, that problem might have remained a sealed book even to the intelligence of Newton. ”

“ Galileo had not altogether neglected to speculate on such a supposition, as is plain from the following extract. It is taken from a letter to Carcaville, dated from Arcetri, in 1637. "I will say farther, that I have not absolutely and clearly satisfied myself that a heavy body would arrive sooner at the centre of the earth, if it began to fall from the distance only of a single yard, than another which should start from the distance of a thousand miles. I do not affirm this, but I offer it as a paradox." ”

“ This must be averted at any price, even at the price of knowledge of the acts of nature. If Galileo’s reformed physics offered no point of attack, his astronomy did; not indeed in the honourable contest of scientific discussion, but by bringing theology into the field against science.
Galileo had never openly proclaimed his adoption of the earth’s double motion, but the demonstration of his telescopic observations alone sufficed to make it one of the burning questions of the day. ”

“ But the discovery which was at once perceived to be most important in itself, and most revolutionary in its effects, was that of Jupiter’s satellites, first seen by Galileo on the 7th of January 1610, and by him named Sidera Medicea, in honour of the grand-duke of Tuscany, Cosmo II., who had been his pupil, and was about to become his employer. An illustration is, with the general run of mankind, more powerful to convince than an argument ”

“ He showed, from the absence of parallax, that the new star could not be, as the vulgar hypothesis represented, a mere meteor engendered in our atmosphere and nearer the earth than the moon, but must be situated among the most remote heavenly bodies. This was inconceivable to the Aristotelians, whose notions of a perfect, simple, and unchangeable sky were quite at variance with the introduction of any such new body; and we may perhaps consider these lectures as the first public declaration of Galileo's hostility to the old Ptolemaic and Aristotelian astronomy. ”

“ We are to remember that in the days of Galileo a telescope could scarcely be pointed to the heavens with impunity, and that a courageous mind was required to contradict, and a strong one to bear down, a party, who, when invited to look on any object in the heavens which Aristotle had never suspected, immediately refused all credit to those senses, to which, on other occasions, they so confidently appealed. ”

“ When I had seen these phenomena, as I knew that corresponding changes of position could not by any means belong to Jupiter, and as, moreover, I perceived that the stars which I saw had been always the same, for there were no others either in front or behind, within a great distance, along the Zodiac,—at length, changing from doubt into surprise, I discovered that the interchange of position which I saw belonged not to Jupiter, but to the stars to which my attention had been drawn, and I thought therefore that they ought to be observed henceforward with more attention and precision. ”

“ These new discoveries were too revolutionary to be believed. Even upright and estimable scientific men, like Welser in Augsburg, and Clavius at Rome, did not give credit to Galileo’s statements until they learnt better by their own observations. The latter, who was the first mathematician in Rome in his day, even said “he laughed at the pretended satellites of Jupiter; you must construct a telescope which would first make them and then show them.” Let Galileo hold his own opinions, and he (Clavius) would hold his. ”

“ The very triumphs of Galileo and his telescopic discoveries were the causes, to a great extent, of those ceaseless and relentless persecutions which were to restrict his labours and embitter his life. The Aristotelians perceived with rage and terror that the revolutionary discoveries of this dangerous innovator were surely, if slowly, gaining ground. Every one of them, with its inevitable logical consequences, pulled down some important stone in the artistic structure of their views of nature ”

“ His letter continues:—"I am so far from disbelieving the existence of the four circumjovial planets, that I long for a telescope to anticipate you, if possible, in discovering two round Mars, (as the proportion seems to me to require,) six or eight round Saturn, and perhaps one each round Mercury and Venus."
The reader has here an opportunity of verifying Galileo's observation, that Kepler's method of philosophizing differed widely from his own. The proper line is certainly difficult to hit between the mere theorist and the mere observer. ”

“ And the nearer the period was drawing when the verdict of the Church was to be pronounced on the Copernican theory, and the more eagerly the secret inquiries about Galileo were being prosecuted, the more confident became the tone of the letters of his friends from the very city where this ominous web was being woven. It seems as if all Galileo's trusty adherents had been struck with blindness, for we should not be justified in doubting the sincerity of a Dini, a Ciampoli, and a Cesi, men who afterwards proved by their actions their true friendship for the great astronomer. ”