Galileo's Dream Read online

  The day for his Venetian demonstration approached. Their best tube showed things nine times larger than the eye saw it. Galileo wanted better, and thought he knew how to get it, but time had run out. For now, nine times bigger would have to do.

  He had Mazzoleni’s crew cover the exterior of the best tube with red leather, embossed with decorative patterns in gold filigree. Mazzoleni also adapted a tripod stand that they sold as an accessory to the military compass, so that they would have something to hold the spyglass steady. A joint on top of the tripod was made of a metal ball held captive in a hemispherical cup, with one screw through the cup to tension the ball, which was screwed on top into a brass sleeve wrapping the spyglass. Using the tripod, one did not have to hold the glass steady while looking through it—something no one could do for more than a second or two. It vastly improved the view through the glass.

  The resulting arrangement was a handsome thing, standing there gleaming in the sunlight, strange but purposeful, immediately intriguing, pleasing to both eye and mind. A month earlier there had been no such thing in the world.

  ON AUGUST 21, 1609, Galileo ferried in to Venice on the morning barge, the looking glass and its stand in a long leather case slung from a strap over his shoulder. Its shape was suggestive of a pair of swords, and he saw the glances of people looking at it and thought, Yes, I’m going in to cut the Gordian knot. I’m going in to cut the world in two.

  Venice stood on the lagoon, its usual grubby midday self. Magnificence at low tide. Galileo got off the ferry at the molo at San Marco, and was greeted there by Fra Paolo. The great friar looked gaunt in his best robes, his face still a wreck, as it always would be. But his crooked smile remained kindly, his look still penetrating.

  Galileo kissed his hand. Sarpi patted the case gently: “So this is your new occhialino?”

  “Yes. In Latin I call it a perspicillum.”

  “Very good. Your audience is assembled in the Anticollegio. It’s everyone who matters, you’ll be happy to know.”

  An honor guard assembled in response to Sarpi’s nod, and escorted them into the Signoria, up the Golden Staircase into the Anticollegio, which was the anteroom to the Signoria’s bigger halls. It was a tall chamber, sumptuously decorated overhead in the usual Venetian style, its octagonal ceiling covered with gilt-framed paintings allegorizing the origin myth of Venice, while the floor underfoot was painted like the pebbled bed of a mountain stream. Galileo had always found it a strange space, in which he had trouble focusing his eyes.

  Now it was stuffed with dignitaries. Better yet, as Galileo soon learned, the doge himself, Leonardo Dona, was waiting in the Sala del Collegio, the larger assembly hall next door that was the most sumptuous room in the Signoria. As he entered the room, he saw Dona and the Savi—his six closest advisors—along with the grand chancellor and other state officials, all gathered under the long painting of the battle of Lepanto. Sarpi had outdone himself.

  Now the great Servite led Galileo to the doge, and after a cordial greeting Dona led the entire group into the Sala del Quattro Porte, then to the Sala del Senato, where many more senators stood in their purple, around tables loaded with food. Under the intricacy of crowded paintings and gilt trim that covered every wall and ceiling, Galileo pulled the two parts of his device from their case and screwed the spyglass on top of the tripod. His hands moved without a quiver; twenty years of lecturing to audiences large and small had burned all possibility of stage fright out of him. And it was also true that it was never that difficult to speak to a crowd to which you felt innately superior. So even though all his hundreds of lectures were now only the prelude to this culmination, he was calm and at ease as he described the work done to make the device, indicating its various features as he pointed it at Tintoretto’s Triumph of Venice on the ceiling at the far end of the room, fixing the image in the glass so that it revealed the tiny face of an angel, enlarged to the point that it stood out as vividly as Mazzoleni’s had on that first night of work.

  With a sweep of his hand, he invited the doge to have a look. The doge looked; pulled away to gaze at Galileo, his eyebrows shot high onto his forehead; looked again. The two big clocks on the long side wall marked ten minutes’ passage as he bumped the glass from one view to another. Ten more minutes passed as one purple-robed man after another took a look through the glass. Galileo answered every question they had about how it was made, although failing to bring up the ratios he had discovered, which they did not even know to ask about. He volunteered often that the process being now clear to him, future improvements were certain to follow, and also (trying to hide a growing impatience) that it was not the kind of device that could best be demonstrated in a room, even a room as big and magnificent as the Sala del Senato. Finally the doge himself echoed this point, and Sarpi was quick to suggest that they take the device to the top of the campanile of San Marco to give it a thorough airing. Dona agreed to this, and suddenly the whole assembly was following him out of the building and across the Piazzetta between the Signoria and the campanile, then inside the great bell tower, winding up the tight iron staircase to the open observation floor under the bells. Here Galileo reassembled the device.

  The floor of the viewing chamber stood a hundred braccia above the Piazza. It was a place all of them had been up to many times. From here one could overlook the whole of Venice and the lagoon, and spot the passageway through the Lido at San Niccolo, the only navigable channel into the Adriatic. Also visible to the west was a long stretch of the mainland’s marshy shore, and on clear days one could even see the Alps to the north. A better place to display the powers of the new spyglass could not have been found, and to aim it Galileo looked through the device with as much interest as anyone else, or even more; he had not yet had an opportunity like this, and what could be seen through the glass was as much news to him as anyone. He told them as much as he worked, and they liked that. They were part of the experiment. He stabilized and sighted the glass very carefully, feeling that a little delay at this moment was not a bad thing, in theatrical terms. As always, the image in the eyepiece shimmered a little, as if it were something conjured in a crystal ball by a magician—not an effect he wanted, but there was nothing he had been able to do about it. Feeling a sharp curiosity, he tried to spot Padua itself. On earlier visits to the campanile, he had marked the vague tower of smoke coming from the town, and knew precisely where it lay.

  When he got Padua’s tower of Santa Giustina centered in the glass, as clear as if he were on Padua’s city wall staring at it, he suppressed any shout, any smile, and merely bowed to the doge and moved aside, so Dona and then the others could have a look. A little touch of the mage’s silent majesty was not inappropriate at this point either, he judged.

  For the view was, in fact, astonishing. “Ho!” the doge exclaimed when he saw San Giustina. “Look at that!” After a minute or two he gave over the glass to his people, and after that the rush was on. Exclamations, cries, incredulous laughter; it sounded like Carnivale. Galileo stood proudly by the tube, readjusting it when it was bumped. After everyone had had a first look, he spotted terra-firma towns even more distant than Padua, which itself was twenty-five miles away: Chioggia to the south, Treviso to the west, even Conegliano, nestled in the foothills more than fifty miles away.

  Moving to the northern arches, he trained the glass on various parts of the lagoon. These views made it clear that many of the senators were even more amazed to see people brought close than they had been buildings; perhaps their minds had leaped as quickly as Galileo’s servants to the uses of such an ability. They gazed at worshippers entering the church of San Giacomo in Murano, or getting into gondolas at the mouth of the Rio de’ Verieri, just west of Murano. Once one of them even recognized a woman he knew.

  After that round of viewing, Galileo lifted the device, helped now by as many hands as could touch the tripod, and the whole assembly shifted together to the easternmost arch on the southern side of the campanile, where the glass could be
directed over the Lido and the fuzzy blue Adriatic. For a long time Galileo tapped the tube gently from side to side, searching the horizon. Then happily he spotted the sails of a little fleet of galleys, making their final approach to the Serenissima.

  “Look to sea,” he instructed them as he straightened and made room for the doge. He had to restrain himself to hide his euphoria. “See how using one’s plain sight, one sees nothing out there. But using the glass …”

  “A fleet!” the doge exclaimed. He straightened and looked at the crowd, his face red. “A fleet is approaching, well out from San Niccolo.”

  The Sages of the Order crowded to the front of the line to see for themselves. Every Venetian holding in the eastern Mediterranean was subject to attack by Turks and Levantine pirates. Individual ships, fleets, coastal towers, even fortress towns as formidable as Ragusa had suffered surprise assaults. Thus the rulers of Venice, all of them with naval experience of one sort or another, were now nodding to each other meaningfully, and circulating into the crowd surrounding Galileo to shake his hand, slap him on the back, ask for future meetings. Fra Micanzio and General del Monte in particular had worked with him at the Arsenale on various engineering projects, and their congratulations were especially hearty. They had first met him twenty years before, when they had brought him in to consider if there were ways the oars of their galleys could be reconfigured to give them more power, and Galileo had immediately sketched out analyses of the oars’ movement that considered their fulcrum to be not the oarlocks, but the water surface, and this surprising new perspective on the problem had in fact led to improvements in oarlock placement. So they knew what he was capable of. But this time del Monte was shaking his hand endlessly, and Micanzio was grinning, with eyebrows raised as if to say with a laugh, Finally one of your tricks will really matter!

  And at this moment, Galileo could afford to laugh with him. Galileo suggested to him that they time the interval between this observation of the fleet through the glass, and the moment when ordinary lookouts saw the ships with their unaided vision. The Doge overheard this and required that it be done.

  After that, Galileo had only to stand by the device and accept more congratulations, and point the thing to resight it if someone requested it. He drank their praise and he drank wine from a tall gold cup, feeling expansive and generous. The colorful throng around him, with its impressive percentage of purple, sparked memories of Carnivale—memories that gave every festive evening in Venice an aura of splendor and sex. Combined with the height of the campanile, and the beauty of the watery city below them, it felt like they stood on Olympus.

  On the winding way back down the campanile stairs, Galileo was joined on one dark landing by the stranger, who then clomped down the iron stairs beside him. Galileo’s heart leaped in his chest like an animal trying to escape. The man was dressed in black, and must have lurked in waiting for Galileo, like a thief or an assassin.

  “Congratulations on this success,” the man said in his hoarse Latin.

  “What brings you here?” Galileo asked.

  “It seems you listened to what I told you before.”

  “Yes, I did.”

  “I was sure you would be interested. You of all people. Now I will return to northern Europe.” Again: Alta Europa. “When I come back to your country, I will bring a spyglass of my own, which I will invite you to look through. Indeed I invite you now.” Then, when Galileo did not reply (they were nearing the bottom of the stairs and the door to the Piazzetta), he said, “I invited you.”

  “It would be my pleasure,” Galileo said.

  The man touched the case Galileo carried from his shoulder. “Have you used it to look at the moon?”

  “No—not yet.”

  The man shook his head. If his face was a blade, his nose was its sharpened edge, long and curved, tilted off to the right. His big eyes gleamed in the stairwell’s dim light. “When you achieve a power of magnification of twenty or thirty times, you will find it really interesting. After that, I will visit you again.”

  Then they reached the ground floor of the campanile, and walked together out onto the Piazzetta, where they were interrupted by the Doge himself, waiting there to escort Galileo back to the Signoria: “Really, my dear Signor Galileo, you must do us the honor of returning with us to the Sala del Senato to celebrate the incredible success of your extraordinary demonstration. We have arranged a small meal, some wine—”

  “Of course, Your Beneficent Serenity,” Galileo said. “I am yours to command, as you know.”

  In the midst of this exchange the stranger had slipped away and disappeared.

  Unsettled, distracted by the memory of the stranger’s narrow face, his black clothing, and his odd words, Galileo ate and drank with as much cheer as he could muster. A chance meeting with a colleague of Kepler’s was one thing; a second encounter, deliberately made, was something else—he wasn’t sure what.

  Well, there was nothing to be done now but to eat, to drink more wine, and to enjoy the very genuine and fulsome accolades of Venice’s rulers. Two full hours of the celebration of his accomplishment were marked by the giant clocks on the sala’s walls, before the lookouts on the campanile sent word down that they had spotted a fleet approaching San Niccolo. The room erupted in a spontaneous cheer. Galileo turned to the doge and bowed, then bowed again to all of them: left, right, center, then again to the doge. Finally he had invented something that would make money.

  CHAPTER TWO

  I Primi Al Mondo

  Having come to this pass, I appealed out of my innocent soul to the high and omnipotent gods and my own good genius, beseeching them of their eternal goodness to take notice of my wretched state. And behold! I began to descry a faint light.

  —FRANCESCO COLONNA, Hypnerotomachia Poliphili (Poliphili’s Strife of Love in a Dream)

  THE NEXT NIGHT, BACK IN PADUA, Galileo went out into his garden and aimed his best occhialino at the moon. He left Mazzoleni sleeping by the kitchen fire, woke none of the servants; the house was asleep. This was the hour, as on so many nights, when his insomnia took hold of him.

  Now his mind was filled with the stranger’s blade of a face, his intense gaze. Have you looked at the moon? The moon tonight was near its first quarter—the bright part almost exactly half the whole, the dark part easily visible against the night sky. An obvious sphere. Galileo sat on a low stool, held his breath, then brought his right eye to the eyepiece. The little black circle of glass was marked on its left side by a luminous white patch. He focused on it.

  At first he saw nothing but a chiaroscuro flecking of grayish black and brilliant white, the tremble of the white seeming to flow over the dark spots. Ah; hills. A landscape. A world seen from above.

  A view from world to world.

  He loosened the screw on the tripod head and tapped the tube, trying to capture in the glass the tip of the moon’s upper crescent. He tightened the screw, looked again. Brilliant white horn; and a dark gray in the curve of the horn, a blackness just slightly washed with white. Again he saw an arc of hills. There, at the border of light and dark, was a flat dark patch, like a lake in shadow. The sunlight was obviously shining horizontally over the landscape—as it would be, of course, as he was looking at the area experiencing dawn. He was looking at a sunrise on the moon, twenty-eight times slower than a sunrise on Earth.

  There was a little round valley; there another one. Any number of circles and arcs, in fact, as if God had been fooling around up there with a compass. But the strongest impression remained the range of hills, there on the border of black and white.

  The moon was a world, like the Earth was a world. Well, of course. He had always known this.

  As for the assertions the Aristotelians made about the moon, that because it was in the heavens it was therefore a perfect sphere, made of some unearthly crystal that was of unchanging purity—well, its ordinary appearance had always rendered that a very suspicious statement. Now it was clearer than ever that Aristotle had
been wrong. This was no great surprise—when indeed had he been right in the natural sciences? He should have stuck to his strength, which was rhetoric. He had had no mathematics.

  Galileo got up and went into the workshop to get his current folio, and a quill and inkpot. He wondered if he should wake Mazzoleni, then decided against it. There would be other nights. He could feel his blood pounding in his head; his neck muscles were sore. This was his night. No one had ever seen these things. Well, perhaps the stranger had, but Galileo suppressed that thought in order to glory in his own moment. All the years, all the centuries had come and gone, the stars rotating above them night after night, and only now had someone seen the hills of the moon.

  The moon must rotate on its axis at the same speed it circled the Earth, to keep the same side always facing it; this was odd, but no odder than many other phenomena, such as the fact that the moon and the sun were the same size in the sky. These things were either caused, or accidental; it was hard to tell. But it was a rotating sphere, that was clear. And so was the Earth also a rotating sphere? Galileo wondered if Copernicus’s advocacy of this old Pythagorean notion could be correct.

  He looked through the glass again, relocated the white hills. The dark part west of them was extremely interesting. Land in shadow, obviously. Perhaps there were lakes and seas too, though he could see no sign one way or the other. But it was not as black as a cave or a dark room at night. One could make out dim large features, because the area was very slightly illuminated. That could not be direct sunlight, obviously. But just as the moonlight illuminating his garden at this moment was really sunlight bouncing off the moon to him, he was no doubt also seeing the dark part of the moon illuminated by sunlight that had bounced off the Earth and struck it—and then bounced back yet again, of course, to get to his eyes. From sun to Earth to moon and then back to him—which would explain the successive diminutions in brightness. As sunlight was to moonlight, moonlight was to the dark side of the moon.