There was only one trial of Galileo, although legends often speak of two... There was only one trial of Galileo, and yet it seems there were a thousand – the suppression of science by religion, the defence of individualism against authority, the clash between revolutionary and establishment, the challenge of radical new discoveries to ancient beliefs, the struggle against intolerance for freedom of thought and freedom of speech. No other process in the annals of canon or common law had ricocheted through history with more meanings, more consequences, more conjectures, more regrets.
Today, a look at Dava Sobel's magisterial Galileo's Daughter. First published in 1999, this was one of the books from an unread stockpile I bought back with me from my last trip home.
I can only find two real weaknesses with this book, both minor. It's a little weirdly undefined in its goals in the first couple of chapters or so, making the pace a feel just a little bit off. It would have helped a little to spell out what the book was going to be about, especially because of the title. We hear almost nothing of the eponymous daughter until a hundred pages in, and even thereafter, she's not really the focus at all.
Not that this matters. What the book actually is is a biography of Galileo, focusing heavily on his conflict with the Inquisition. The central thesis is that while this might have been a conflict between an academic and the Church, by no means was this a clash between science and religion. Along the way we get an in-depth look at Galileo the man, particularly drawing on letters from his daughter, but also plenty of theological and philosophical insights.
If she fails to give a clear mission statement of what the book is supposed to be, Sobel nevertheless manages to balance things perfectly. The book is not one word too long or too short. We get enough background to Galileo's life to understand the trial in its full context without losing focus; enough detail on the trial itself to understand how things proceeded without getting into unnecessary minutiae; enough of the aftermath to follow the consequences without losing sight of Galileo the man. We get all the core philosophical arguments, all the essential subtle differences between the views of Galileo and his detractors, presented in a clear and unbroken narrative flow. Overall, I think I have to give this one 9/10.
I cannot possibly give a summary that retains Sobel's narrative without still being many thousands of words long. So instead, let's try the usual thematic approach, gradually building up to the all-important trial which has become so (arguably) spuriously emblematic of the conflict between science and religion. In this first part, I'll look at Galileo's other achievements outside astronomy and his character as a person. In part two, I'll cover his philosophical approach to scientific inquiry and his conflict with the Church.
1) Galileo the Polymath
Perhaps the first thing that becomes apparent is that Galileo was no one-hit-wonder. To be honest this is something I should have been more aware of, but while I knew something of Galileo's astronomy, I had only vague impressions of his experiments on motion, and I knew nothing at all about his more practical skills.
Here Galileo is revealed to be a true renaissance man, a veritable polymath to rival Da Vinci except for his lack of artistic achievements. He possibly could have gone down this route – his father was a musician and his own drawings of the Moon are of extremely high quality – but he seems to have preferred to have concentrated firmly on science and engineering. His more creative tendencies were reserved for his public outreach activities and tending to his garden. And this is no bad thing, since, unlike Da Vinci, he left little unfinished. His interests were wide-ranging, and yet he seemed to have no issue with taking years to complete his projects : not to say that he wanted things to take this long, but he wouldn't get distracted along the way. If he was ever derailed, then it wasn't by choice, and he'd almost always eventually pick up where he left off.
Galileo's most famous non-astronomy work is surely dropping cannonballs off the Leaning Tower of Pisa. Sobel is careful is his framing here of this "legendary" experiment, but in the text as written, it sounds very much as though he actually did do this, and much earlier in his career than in the more carefully-documented case of rolling balls down an inclined plane. Still, he wrote with some bitterness that while the larger ball did beat the smaller, the point was that they don't fall at anything like the same speed, as Aristotle had claimed : his detractors were completely missing the point. "Speaking of my tiny error", he wrote, they "remain silent about his enormous mistake".
He would tackle more minor but important problems throughout his life. In Venice he was granted a patent on an irrigation device, and while under house arrest much later in life, he prepared a practical demonstration to explain why a recent bell-casting had failed in spectacular fashion. For income, he was partly supported by the sale of his own geometric calculating compass : a sort of elaborate slide-rule for a wide variety of mathematical calculations. Whilst conducting his early observations of the heavens, he also showed, as a side project, that objects float because of their density and not their shape as the prevailing wisdom dictated*, thus overturning centuries of conventional wisdom by having some bloody common sense.
* There was an odd belief that ice was actually heavier than water, which is something so easy to test that it just seems bizarre that nobody ever checked it.
Perhaps the most impressive Galilean spin-off came later. During his experiments on acceleration with inclined planes, he developed standardised measurements to ensure he was making fair comparisons between data points. This was in itself a monumental breakthrough. First, that he came up with a practical method to reach the precision and accuracy needed, but secondly, that the concept of standardised measurements simply didn't exist. This was a profoundly non-mathematical world, and while the mentality of those in the distant past can be startlingly similar to our own, in other ways it can be shocking in its most fundamental differences. Galileo played no small role in changing that. And finally, he did this in his old age while in chronic ill health. So much for the idea that scientific revolutions are the province of the young... In his rigorously quantitative approach, Galileo would surely appreciate the cliché that age really is just a number.
Oh yes, and he also invented the microscope. Janus-like, he looked both to world above and below, and if he spent more time on the firmament than terra firma, this seems to have been merely a matter of happenstance. Galileo appears to have been very much the right man at the right time : he had the practical skills needed to develop the instruments and the mindset to appreciate just how radical his discoveries really were. As he himself wrote with no false modesty :
"I render infinite thanks to God for being so kind as to make me alone the first observer of marvels kept hidden in obscurity for all previous centuries... four planets never seen from the beginning of the world right up to our day."
Through some admittedly blurry images from crude glass, Galileo's discoveries would change the world. Small wonder that not everyone approved. With the simplest of devices and an image quality that still left much to be desired, he was proposing nothing less than a total restructuring of reality.
2) Galileo the man
But before we get carried away, it's worth a brief look at the character of Galileo. The figure that emerges from Sobel's telling is a genius and generally a good egg by the standards of his day. He seems to have been extremely generous to his family, sparing what little income he had (in his early days) to support them with enthusiasm rather than reluctance.
But he was not much of a social radical. True, he wrote a rather bawdy poem bemoaning the fact that his scholarly toga wouldn't let him visit brothels (we've all had that problem), but he also put his daughters in convents and didn't marry his partner as this was just not the done thing for scholars at the time. Which also reveals that even this most Catholic of countries could, and did, easily find ways around the rules when it suited them. It was never a case of the Church having absolute control over people's lives, which is purely the stuff of myth.
The advantage of Sobel's biography is to set Galileo's work in the context of his personal life. In many scientific histories, it's easy to think of them as pathologically obsessed with research : this Galileo is, instead, a real person with real person things to do. We follow his surprisingly mobile career in institutes in towns across Italy, his chronic ill health (making it all the more impressive that he reached 77 years of age by the time of his death), his love for his family along with his (very) occasional chastisements. We see him being delighted to send them fruit and exasperated when they turn up en masse for a while in his rather modest accommodations; the embarrassment of his daughter on learning that "buffalo eggs" were actually a type of cheese is still palpable after more than three centuries.
What emerges is, as you might expect, a complex character. He was famously entertaining and flamboyant, and could use this in the most obsequious terms of flattery when seeking a patron. He seems to have a real need to be liked by people as well as persuade them of his ideas, but also (like many exuberant promoters) was quite willing to offend. Although generally quite careful in what he wrote, he would sometimes deliberately tread on people's toes if they disagreed with him. He definitely seems to have had an arrogant streak that was perhaps the source of his rhetorical flair, but it was hardly unjustified : he really had seen things that nobody had seen before and contemplated them in ways undreamt of.
But he also seems to have been something of an egalitarian and favoured a meritocratic approach to education. He worked under the patronage system and adopted university dress codes only insofar as he could not avoid them, preferring more casual attire whenever possible. He wrote his outreach dialogues in Italian, not Latin, having a genuine belief that this would be of benefit to the common man and not just to the scholarly elite. If he does seem to nonetheless have enjoyed being one of the elite, he definitely valued learning wherever he found it. He does not appear to have been especially concerned with fighting culture wars or calling for any sort of social reform. He would help people when he could, but doesn't seem to have contemplated any structural changes to society – though he did have some very definite ideas about where the Church was going wrong theologically.
Perhaps his biggest contradiction was that he was willing the bend the rules and outright lie in the interests of the greater truth. In this we must allow two things : first, that most of us will probably try to save our own skins ahead of sticking to our principles, and that parts of the Church were most certainly corrupt. "No-one has spoken with more piety or with greater zeal for the Church than I", he wrote. Yet when necessary, he also called his own work, "merely a poetical conceit, or a dream... this fancy of mine... this chimera." His beliefs were sincere, but his approach was flexible.
Galileo knew he was right and the Church was wrong, and that in his mind, suppression of his ideas was harmful to everyone – including the Church. If he had to lie about what he really believed in order to publish it, then so be it. If he had to take desperate measures in publishing them in the protestant Netherlands, and then proclaiming in transparently ridiculous terms that he had no idea how that happened, then he was surely justified in doing so. Sticking rigidly to his principles and telling the Church where to shove it might have been a heroic stance to take, but Galileo was no hero... and it would have been profoundly unwise. Galileo was right and the Church was wrong, but as we shall see, this is not at all the same as the claim that science and religion were at odds. In Galileo's own mind, such a thing was not even possible.
In part two, we'll move on to see how Galileo had no issues in reconciling science and religion, and indeed the very idea of a conflict was barely imagined. Nor was he alone in his theological happiness, with his views being widely shared amongst the upper echelons of the Church. Naturally, then, we'll conclude with a look at how, despite everyone being one big happy god-fearing family, everything went so catastrophically wrong for a man so used to widespread acclaim and admiration.