Ordering the Heavens: Hevelius’s Revolutionary 17th-Century Star Catalog and the First Moon Map
By Maria Popova
On September 26, 1679, a fierce fire consumed the Stellaburgum — Europe’s finest observatory, built by the pioneering astronomer Johannes Hevelius (January 28, 1611–January 28, 1687) in the city of Danzig, present-day Poland, decades before the famous Royal Greenwich Observatory and Paris Observatory existed. That autumn day, Hevelius — whose exquisite lunar engravings are considered the first true maps of the Moon and who believed, long before it was established by scientific consensus, that the stars in the night sky were thousands of suns like our own — had retired to a garden outside the city, “feeling himself oppressed with great and unaccustomed troubles, as if presaging some disaster,” as a friend later recounted in a letter. In Hevelius’s absence, his coachman had left a burning candle in the stable and the wooden platform across the roofs of Hevelius’s three adjoining houses, upon which his fine brass instruments and telescopes were mounted, had caught aflame. As the fire raged on, the town’s people broke into the observatory trying to save Hevelius’s precious bound books, throwing them out the windows. Some survived, some were pilfered. His optical instruments and almost all of his bountiful unbound manuscripts perished.
Hevelius was sixty-eight when his observatory was destroyed. But despite having spent forty years building his own instruments, making groundbreaking observations with them, and engraving and printing his own books — fruits of labor most of which were consumed by the fire along with all his “worldly Goods and Hopes,” as he later wrote in a letter to the king of France — he refused to sink into bitterness and resignation. Instead, he set out to rebuild the observatory so he could return to observing the stars.
His resilience was in large part fueled by the miraculous salvation of one of his manuscripts — his fixed-star catalog, which contained the results of thousands of calculations of the positions of the stars made over decades of patient observation. The small leather-bound notebook was the sole manuscript to survive the fire, presumably saved by Hevelius’s 13-year-old daughter Katharina Elisabeth, the sole family member in Danzig at the time of the fire, who had a key to her father’s study. Half a millennium later, it was rediscovered. In 1971, it made its way to Utah’s Brigham Young University, becoming the one-millionth acquisition by the institution’s library. To mark the landmark event, the university published a slim volume titled Johannes Hevelius and His Catalog of Stars (public library) — an immeasurably engrossing chronicle of the life and legacy of Hevelius, the 300-year odyssey of his fixed-star catalog, and how it changed our world.
Hevelius was born in 1611, a year after Galileo had made his first observations with a telescope, at a time of blazing scientific breakthrough and controversy. His father, a successful merchant, pressed young Johannes to follow in his footsteps rather than pursue what he perceived to be the fool’s gold of the scientific revolution, and sent the nine-year-old boy to Poland to study Polish. (At the time, Danzig was part of the Prussian Confederation and Hevelius’s native language was German, something his father saw as an obstacle to doing trade.) When the boy returned at age sixteen, he pleaded with his father to allow him to continue his formal education. The old man eventually relented and young Hevelius quickly fell in love with mathematics, under the influence of his mentor, the acclaimed mathematician, astronomer, and polymath Peter Krüger. He also learned Latin, the language of most scientific publications and international correspondence, and under Krüger’s nurturing watch began learning to draw, engrave, and build rudimentary instruments out of wood and metal. As Krüger’s sight began deteriorating, he encouraged young Johannes to take an active part in the observation part of science.
When he was nineteen, Hevelius watched the total solar eclipse of 1630 and saw Saturn veil the Moon in a rare lunar eclipse. He was filled with cosmic awe, but wasn’t ready, or didn’t yet know how, to translate this sense of purpose into a career in astronomy. Instead, he married the daughter of a distinguished businessman and settled into the comfortable life of a merchant. But in 1639, when Krüger was on his deathbed, he urged young Hevelius not to let his exceptional gift go to waste. Aware that his end was near, Krüger lamented that he would miss the rare solar eclipse about to occur later that year and exhorted Hevelius to take up the historic task of its observation.
His teacher’s dying words reawakened Hevelius’s forsaken but fiery love of astronomy. On June 1, 1639, he meticulously observed the solar eclipse, then decided to dedicate the rest of his life to understanding the cosmos. True to the notion that revolutionary discovery is the product of “the meeting of the right people at the right place with just the right problem,” Hevelius harnessed the fruitfulness of his timing — just as he chose to devote himself to astronomy, the telescope was revolutionizing the field and making possible discoveries never before imagined.
Hevelius was particularly enchanted with the Moon and made it the target of his first obsessive observations. Dissatisfied with the imprecise and vague drawings of its surface, he decided to complain the way all innovators do — by making something better. Turning his modest telescope to the Moon and enlisting his talents as a draftsman and engraver, he set out to create a large, complete, delicately detailed map of its surface. But he quickly realized his telescope wasn’t up to the task — so he decided to build a better one himself. In 1647, after five years of methodical work fueled by this greatest talent — dogged patience — Hevelius published his magnificent maps under the title Selenographia.
One of his first great admirers was the famed English traveler Mundy who, upon seeing the maps, marveled in his diary:
Of the Moone he hath Made above 30 large mappes, prints, or Copper peeces of the Manner of every daies encrease and decrease, deciphering in her land and sea, Mountaines, valleies, Ilands, lakes, etts., making in another little world, giving Names to every part, as wee in a mappe of our world.
Praise continued to pour in from all over Europe, but the greatest validation of the maps’ merit was the fact that they endured as the best Moon maps for more than a century, despite the rapid progress of observational tools — assurance, perhaps, that what sets innovators apart from the rest aren’t their tools but their creative vision in using those tools and their unrelenting work ethic.
Encouraged, Hevelius set out to improve his observations, building bigger and better telescopes, with an unblinking eye on his most important project — the quest to revise the paltry star catalogs of the era. Star catalogs, Hevelius knew, were an essential tool for astronomers, enabling them to track the changes taking place in constellations — changes that would profoundly challenge the religious dogmas of the day, which depicted the universe as a static starscape laid out by a divine creator a long time ago. At a time when heliocentrism — the knowledge that the earth revolves around the sun, rather than vice-versa as the church claimed — was still a novel and controversial concept, proving that the universe was a dynamic ecosystem of bodies would be a major feat for science. But star maps had to be accurate and precise in order to reveal these changes.
So, in 1641, shortly after his thirtieth birthday, Hevelius began building his rooftop observatory. Three years into his work, the city of Danzig presented him with a gift — an astronomical instrument that had been stored in Danzig armory for many years, alongside firefighting equipment, the use and worth of which had remained unknown. A six-foot contraption known as an azimuthal quadrant, it had been envisioned by Krüger but remained uncompleted by his death. Once again, Hevelius’s mentor was shaping the course of his life, even from the grave — Hevelius completed the instrument, mounted it on his observatory tower, and began making observations with it. With its ability to measure the angular distances between neighboring stars, it became a key tool in the completion of his stellar catalog. Long before the invention of the meridian circle, Hevelius used his instrument to record coordinates according to what was essentially an equator line.
Over the sixteen years that followed, Hevelius expanded his observatory and equipped it with the best instruments he could build or acquire. His became Europe’s finest observatory.
But perhaps the most important event in Hevelius’s life and career was not one of science but of romance — or, rather, an exquisite fusion of the two. When he was 55, widowed for over a year, Hevelius married a young woman named Elisabeth Koopman, the daughter of an acquaintance of his, a Danzig merchant. Hevelius had known Elisabeth, many years his junior, since she was a child, when she had implored him to teach her astronomy. As a young woman, she had renewed her request, enveloping the now-revered astronomer with admiration and, soon, adoration. A German biography quotes her as exclaiming one night, while looking through Hevelius’s telescope:
To remain and gaze here always, to be allowed to explore and proclaim with you the wonder of the heavens; that would make me perfectly happy!
It was, essentially, a marriage proposal, which Hevelius gladly accepted. They were wedded at St. Catherine’s Church in 1663. Johannes was 52; Elisabeth was 17. Before recoiling in modern judgment, it’s important to note that such unions were far from uncommon at the time. But perhaps more importantly, they were often the only way for women, who were were barred from most formal education and scholarly work, to gain access to creative and intellectual pursuits through a kind of conjugal apprenticeship.
That is precisely what young Elisabeth, who had developed an active interest in astronomy at an early age, did. Hevelius saw in her a kindred mind, and they began making astronomical observations together as she mastered the craft. Nearly two centuries before Maria Mitchell, Elisabeth Hevelius essentially became the first Western female astronomer. All the while, she emboldened her husband — another biography cites her most frequent words of encouragement to him:
Nothing is sweeter than to know everything, and enthusiasm for all good arts brings, some time or other, excellent rewards.
In the years following their marriage, Elisabeth continued to observe the stars, but also gave birth to four children — a boy, who died in infancy, and three girls. All the while, she worked alongside Hevelius in completing the star catalog that had become the holy grail of his scientific career and his highest hope for a lasting legacy. In one of his books, Hevelius, who spoke highly of Elisabeth’s scientific skills and called her the “faithful Aide of [his] nocturnal Observations” in a letter to the king of France, included an engraving of the duo making an observation together.
With Elisabeth’s help, Hevelius published the first star maps in a planned series in 1673. The most extraordinary thing about them was that, as he explained in the preface, he had made most of the observations not with a telescope but with a naked eye — a practical method he favored, despite acknowledging the theoretical advantages of telescopes. It was a controversial statement in the golden age of telescopic studies, which caused a tumult among Europe’s astronomers, but Hevelius’s astounding accuracy spoke for itself and established him as the last and greatest of the naked-eye star observers.
But the fire that destroyed Hevelius’s observatory in 1679 nearly put a halt to his quest to catalog the stars. Desperate to resume his project, Hevelius wrote to French king Louis XIV, one of his longtime patrons, a lyrical and heartfelt plea for financial support. The letter stands as an exquisite exemplar of the art of asking, as well as the curious testament to how deeply religious piety permeated the minds of even the most dedicated scientists of the time:
Most Illustrious and mightiest King, most beneficent Lord: Your high Favour and incomparable Mercy have ever spurred me to scatter with diligence the Seeds of my Gratitude and to sow them in the Bosom of Urania, so that I have set in the Heavens nigh to seven hundred Stars which were not there aforetimes, and have named some of them after your Majesty. . .
But, alas, will this Fruit of the Labours of mine Age ever see the Light of Day? For no man knoweth what the Dark of Even bringeth. Woe and alas, how multitudinous the Misfortunes that embroil the Life of Man. All my worldly Goods and Hopes have been overturned in the Space of scarce an Hour.
Rumour of the dread Conflagration which hath destroyed my astronomical Tower hath no doubt already sped upon rapid Feet to Paris. Now I come myself hasting to Your Majesty as Herald of this great Woe, clad in Sackcloth and Ashes, deep distressed by this Visitation from Him Who judgeth all Things.
May the Windows of the Human Soul never again look upon such a conflagration as devoured my three Houses… if God had not commanded the Wind to turn in its Course, all of the Old City of Danzig would surely have burned to the Ground…
Saved by God’s Mercy were .. Kepler’s immortal Works, which I purchased from his Son, my Catalogue of Stars, my New and Improved celestial Globe, and the thirteen Volumes of my Correspondence with learned Men and the Crowned Head of all Lands.
But the cruel Flames have consumed all the Machines and Instruments conceived by long Study and constructed, alas, at such great Cost, Consumed also the Printing Press with Letters … consumed, finally my Fortune and the means which God’s Mercy had granted me to serve the Royal Science.
If such Damage should crush me to the Ground, I whose Locks are Hoary and who am not far from my Appointed End, could any reasonable Man cast Blame upon me therefor? Yet with the Aid of my many Friends I hope that I may restore my Specula observatoria, and implore you, Most Illustrious Monarch who have so often manifested Royal Munificence toward me, to breathe by some further Token of your Generosity new Life into the Work which may still lie before me. Then will I no longer bewail my cruel Misfortune, and yours, Noble Majesty, will be eternal Fame for all Posterity.
The king, moved, granted his request. But the most generous support came from the king of Poland, who granted Hevelius a yearly stipend of 1,000 Danzig gulden for the rest of his life. The astronomer thus went on to resume his observations and finish his publications.
In October of 1681, the French writer Jean-François Regnard visited the newly rebuilt observatory and marveled in his little-known diary not only at Hevelius’s prolific writings and his impressive proto-rolodex, but also at his sublime cross-pollination of art and science:
His works, the number of which exceeds all belief … are full of plates made with his own hand: he shewed us them all, besides fifteen large volumes, as thick as the Lives of the Saints, full of letters which the most learned men on the whole world had written to him on various subjects.
But Hevelius remained preoccupied with the completion of his catalog of the stars, which had become his most consuming endeavor and his highest hope for legacy. Alas, he never fully attained it — at least not as a sole creator. On January 28, 1687 — the exact date of his 76th birthday — Hevelius died, having outlived the era’s life expectancy by decades. But Elisabeth, who had assisted him in the catalog all along, took it upon herself to finish Hevelius’s lifelong quest. She completed the book, dedicating it to the generous Polish monarch. The finished catalog included more than 600 new stars that Johannes and Elisabeth had observed, as well as a dozen new constellations, whose names, as given by Hevelius, astronomers still use today.
Elisabeth guarded the manuscript carefully until her death in 1693, at the age of 46. She left to each of her three daughters a complete set of Hevelius’s published works. The eldest, Katharina — who as a teenager had saved her father’s star catalog from the fateful fire — fittingly inherited a beautifully illuminated copy of the book, originally prepared as a gift for Louis XIV. But once Katharina married, her husband sold most of Hevelius’s prized books to a museum in Russia. The manuscript of the star catalog that had survived the fire was overlooked. Ironically, the greedy son-in-law didn’t think Hevelius’s magnum opus valuable enough to sell.
But the story of the star catalog and its miraculous survival doesn’t end there: In 1734, during the Saxonian-Russian siege of Danzig, artillery fire struck the son-in-law’s house and destroyed most of the property. One bomb fell directly into the room where Hevelius’s manuscripts and instruments were kept, destroying nearly all unbound manuscripts. But the star catalog somehow survived once more. Over the next two centuries, it made its way to the Danzig Institute of Technology. Then, as World War II broke out, the German administration evacuated the Institute’s library to a nearby village, where it was almost completely destroyed in the last days of the war. And yet the star catalog, by yet another stroke of mysterious fortune, survived its third assault by fire. This strange phoenix of science finally arrived at Brigham Young University in 1971, where it has remained safe from fire and brimstone in the decades since.
Complement engrossing out-of-print gem Johannes Hevelius and His Catalog of Stars with this modern-day field guide to naked-eye stargazing, then revisit pioneering astronomer Maria Mitchell’s wisdom on education and women in science.
Published August 11, 2014