To preface, uploading the photos resulted in complete disarray and random photos appearing where I hadn’t intended. If you’d like to consult the photos while I fix this, please follow this link to a document including them from Special Collections. https://docs.google.com/document/d/1I10LG4d49UvafGPVNz7Q8mEN4CvsUQ0vO2HGmChkXbw/edit?usp=sharing
For centuries, no, for over a millennium, humans looked up into the sky and believed themselves at the center of everything. As far as they knew, the universe was created specifically for them, the Earth did not orbit the Sun, and instead, vice versa, as the planets were claimed to orbit Earth as well. This geocentric model dominating human thought was derived from the studies of Claudius Ptolemaeus, a Greco-Roman mathematician born around the year 100 AD (Wikipedia Contributors).
Throughout his intellectual pursuits in mathematics and astronomy, Ptolemy did plenty of writing that has stuck around until our time. Of course, it must have, or else I wouldn’t be doing this assignment. Though, given his ancient age, it’s remarkable his work stayed intact and remembered until the age of printing.
The following bibliography will detail a compilation of Ptolemy’s works, titled “CLAVDII PTOLEMAEI PE lufienfis Alexandrini omnia qua extant opera, prater Geographiam, quam non difsimiliformantrperriméadidimus fumma cura & diligentia caftigata ab Erafmo Ofualdo Schrekhenfuchfio, & ab eodem Ifagoicain Almageftum prafatione, & fidelifsimis in priores libros annotationibus illuftrata, quemadmo-dum fequens pagina catalogo indicat.
This title may be wordy in Latin, though it is just as wordy in a rough English translation reading, “The complete works of Claudius Ptolemy of Pelusium, the Alexandrian, except for the Geography, which we have very recently published in a similar form; carefully and diligently corrected by Erasmus Oswald Schreckenfuchs, and enriched with his introductory preface to the* Almagest* and faithful annotations on the earlier books, as the following page’s catalogue indicates.”
Immediately, we’re let in on a couple of important notes. First, the writing was not entirely that of Ptolemy’s. A preface to Ptolemy’s most famous work, the Almagest, was written by Erasmus Oswald Schreckenfuchs. Erasmus was born in 1511 in Austria, which gives a better idea of the date of publication (Wikipedia Contributors).
Secondly, the use of the diction “corrected,” accompanied by the annotations, implied that Ptolemy’s work had since been recalculated. This is to say, the work was not explicitly presented as fact, as it once was.
Going back to the first note, the date and place of publication are verifiable. The line reading, Basileae, in officina Henrici Petri, mense Martio anno M.D.LI.” translates to “In Basel, in the workshop (printing house) of Henricus Petri, in the month of March, in the year 1551. (“PAL: Basel, Henricus Petri, 1551”)” With the origin of Basel, Switzerland, Petri was cited as the print shop owner involved in the circulation of this book. Take, for comparison, the print of Argonautica, embellished with the town name and a similar image (“Heinrich Petri”).
Knowing the creators, it’s also neat to look at who had their hands on this work in the past. Looking at a bookplate inside the front cover, a crest could be seen with the label “Aytoun of Inchdairnie” below it. A simple Google search with that label resulted in some brief history. According to a website detailing landed families of Britain and Ireland, a member of that family, “Andrew Aytoun (d. 1513) [was], a loyal servant of King James IV, [and served as] Chamberlain and Captain of the Royal Castle of Stirling. (Kingsley)” While the specifics of which Aytoun family member created the bookplate were unknown, it is important when considering what type of family would own this book.
Now, with a better understanding of who the book passed through to get to SDSU, it’s time to look at the book itself. As everyone naturally does, the cover will be up first to judge.
The cover looks and smells like vellum, carrying a rich, intoxicating musk that must indicate years of degradation. I noted the intoxicating factor, as the smell jumped out before I even opened the book. Consistent with the fact that vellum tightens with moisture, the tan surface had a smooth texture and looked glossy in light–light that appears to have altered the materials.
Near the yapp edges, which are the vellum overhanging and protecting the fore-edge, a large discoloration could be seen (“Etherington & Roberts. Dictionary–Yapp Style”). While it appeared to be the result of light exposure or oxidation, judging by the cracked yet smooth surface, I argued it’s the result of a greater degree of exposure. Discolorations such as this were common in older vellum-based books, though the specific location and severity could suggest a human’s impact.
Another detail, just under the discolorations, appeared to be a small wormhole. Again, for old vellum-based books, this was common, suggesting various bookworms have had their turn reading. Also, no title appears on the spine.
Regarding the binding, it looked to be in its original copy, as the cover was bound over the binding. Though a better name exists as “alum-tawed thongs,” which are narrow, tanned strips of leather earning their name for the thick quality (“Thongs | Language of Bindings”). And while delicate, the book felt very much stable in its configuration.
Even with the protective layer, Ptolemy’s work suffered from human error, evident by the watermarks. These marks were littered throughout the book, usually appearing towards the top of the page, and even showing on the headcap.
This brings attention to the page itself, which, judging by its fibrous patterns in light, appeared to be rag-cotton paper. Also, the folio is quite larger than the average paper size today. It was cool to see the slightly uneven trimming of the folio, suggesting an inexact system was used–most likely a human hand (“Heinrich Petri”)..
The folio’s stiff quality was important when asking why it was made that way. Most likely, the folio needed to be thick enough for the larger woodplate impressions that appear. With a thinner material, it would have been more susceptible to wrinkling.
These woodplate impressions span the entirety of the book and are specifically notable in the printing house’s emblem and the elaborate initials. These initials, some of which display children and beasts, appeared at the beginning of most works, and even in the Index.
Clearly, the creators were not pinching pennies by minimizing text. This was also seen in the vast amount of blank space occupying the work and the wide margins. Except, this act was intentional. As stated before, Ptolemy’s work was studied for centuries, which gives this work an intellectual meaning. All blank space could then be interpreted as room for marginalia, which served its purpose.
This book was littered with annotations such as highlighted sections, added notes, and even crossed-out sections. Taking the title into account, it’s important to distinguish whether the notes came from Erasmus or a potential second hand. Unfortunately, this task wasn’t easy, yet it spoke of the intellectual nature of the book, designed for interaction and annotation.
The printed words were primarily black in Latin, with the occasional Greek, in line with Ptolemy’s origins. The font was Roman, differing in size from heading to body text. Aside from the fact that I can’t speak Latin, the legibility was clear, yet the body text was slightly tight and bloodied from the ink.
The printers included an interesting design on one page of text that I first described as an upside-down triangle. Google helped me reword this description into centered, tapering text. This style was quite new at the time and displayed the expansion of aesthetics, while also serving as more room for marginalia.
All of the works composing this book were detailed in the index, notably the Almagest and annotations on it, though it’s important to consider the imagery as well. Woodcut designs appeared mainly in the form of diagrams and models of Ptolemy’s work. Most notably, a large double-page woodcut was bound between folios, displaying a constellation map. The print was folded irregularly towards the gutter and has tape supporting what must have been a recent tear. This too-interesting topic of the imagery then finally leads to the second section.
Part II
As a collection of some of the most famous and influential scientific texts, CLAVDII
PTOLEMAEI PE lufienfis Alexandrini… detailed theories on the Earth and universe that defined human thought for centuries. Woodcut designs help relate the information, displaying an intimate focus on both aesthetics and intellect. Boasting above all the designs, the irregularly folded constellation map serves as the most unique feature of this book.
Printed in Petri’s Basel workshop with the help of Erasmus, the map, among other images, visually relates Ptolemy’s theory on the geocentric universe. In an age before Copernicus disproved the Earth as being the center of everything, these images shed light on how knowledge and belief systems intertwined to come up with universal conclusions.
Based on the extraordinary printing of the image and the later taping repairs, the Ptolemy models are representative of the importance of history in finding new conclusions. Though at the same time, for the very reason of their importance, the question is asked: Do these models hold up today?
First, it’s necessary to go back to the description. Labeled as “Imagines Constellationum Borealium,” translated to “Images of the Northern Constellations, (Google)” the large double-page woodcut makes the northern celestial hemisphere the heart of the collection. This is both metaphorical and literal when considering that the image is in the near middle of the book.
The star chart displays the region of stars and their locations according to Earth, with each constellation named in Latin. In our San Diego State University copy, the fold bisects, creating a dark aging or usage mark around what appears to be twins–the cancer zodiac sign. The twins are just one of the examples of zodiac figures recognizable today.
Whether through the crab, the bull, or the scorpion, it goes to show how this work from ages ago remains and dominates our culture today. The printers even go so far as to include an index for the zodiac signs, as seen in the photo below.
Back to referencing the constellations, black ink in the label appears to have faded, though the overall impressions look well-kept and unharmed. This preserves the geometry of the work, which was not affected by the apparent tear covered by tape close to the gutter. Despite its flaws, and maybe considering them as well, this piece is beautiful beyond belief. The aesthetics indicate how visual art and writing coincided, and how imaginative the brains were, not just in creating this, but inspiring it. It is fair to say this was an idealization of the sky, but a preferable one at that.
As seen in the photo above, in their sky, rather than the Earth orbiting the sun, the reverse occurred. Needless to say, this claim has since been discredited.
This idealization made the claim of Earth being fixed and the sky, or heavens, revolving. I note the word heavens as some figures take the form of angels, and also because belief systems at the time saw the heavens as a physical place rather than metaphysical, as is common today. It would only make sense to paint the physical sky with beauty, then, in effect, reflecting the beauty they believed to be heaven (The Editors of Encyclopaedia Britannica).
Within the geometry on the page, the predicted motion of stars and planets may be observed. One large problem appears when considering the idea of retrograde motion. While Ptolemy accounted for this, he predicted planets’ irregular movements as a result of epicycles, not full orbits. These epicycles, although mathematically regarded, were far off and did not correctly explain retrograde motion as later years would (The Editors of Encyclopaedia Britannica).
Except that, at the time of publication, these theories were already disproven. First printed in 1543, De revolutionibus orbium coelestium, or On the Revolutions of the Heavenly Spheres, relayed the heliocentric theory of the astronomer Nicolaus Copernicus (Wikipedia Contributors, “De Revolutionibus Orbium Coelestium”). This theory completely disproved Ptolemy’s geocentric model of the universe, and yet, the printers under Petri’s jurisdiction chose to move forward anyway. This then gives reason to the numerous annotations spanning throughout the work, and disregards some of its intellectual value.
Now, half a millennium later, the image “Imagines Constellationum Borealium” serves as both an artifact and an idea. As the stars have not faded, so too have the bright minds influencing our modern day not faded. Without Ptolemy’s work, there could very well be no Copernicus. And without the countless others assisting in refining what we understand as truth, we could still believe in the Geocentric model.
Under it all, a metaphor exists in the need to visualize order in the unknown. The symbols and characters in the sky represent beauty that was believed to be there, all for the good of the people. To modern eyes, the chart’s centered Earth may feel ignorant, even naïve, yet its beauty invites respect. To put that much thought into something constitutes true belief, which, now with an abundance of truth, is sometimes lacking.
Going deeper into the details, the tapeworm on the constellation map could signify a human attempt to preserve the fleeting beliefs. To adapt to new knowledge is one thing, but to drop your belief system is another. Even if Copernicus’s new model disproved the geocentric one, it could not put to rest an inherently metaphysical belief of many.
Today, many people address the Zodiac signs with the same regard as then. While Ptolemy probably didn’t predict these formations to be used as character traits and relationship compatibility, he did lay the groundwork for these developments. So, in asking again how the book’s works hold up today, disregarding the clear discrepancies from modern science, I would answer pretty well.
Within the elaborate geometry, Ptolemy and the printers remind us not of the importance of answers, but of the quest. By applying their belief systems and knowledge, we’re also able to understand why the answers were found in the first place.
And as we unfold the pages, continuing our search for the truth, we’re reminded of the countless others who have done the same. And while the truth may have been the external goal, it’s only in finding the fingerprints of others that we join our one, unified goal.
Works Cited
“Etherington & Roberts. Dictionary–Yapp Style.” Culturalheritage.org, 2025, cool.culturalheritage.org/don/dt/dt3832.html. Accessed 30 Oct. 2025.
Kingsley, Nick. “(263) Aytoun of Inchdairnie House.” Blogspot.com, 30 Oct. 2025, landedfamilies.blogspot.com/2017/05/263-aytoun-of-inchdairnie-house.html. Accessed 30 Oct. 2025.
“PAL: Basel, Henricus Petri, 1551.” Badw.de, 26 July 2025, ptolemaeus.badw.de/print/google.com. Accessed 30 Oct. 2025.
The Editors of Encyclopaedia Britannica. “Geocentric Model.” Encyclopædia Britannica, 2019, www.britannica.com/science/geocentric-model.
“Thongs | Language of Bindings.” Ed.ac.uk, 4 Aug. 2021, lob.is.ed.ac.uk/index.php/concept/3069. Accessed 30 Oct. 2025.
Wikipedia Contributors. “De Revolutionibus Orbium Coelestium.” Wikipedia, Wikimedia Foundation, 25 Mar. 2019, en.wikipedia.org/wiki/De_revolutionibus_orbium_coelestium.
—. “Erasmus Oswald Schreckenfuchs.” Wikipedia, Wikimedia Foundation, 7 Dec. 2024, en.wikipedia.org/wiki/Erasmus_Oswald_Schreckenfuchs.
—. “Heinrich Petri.” Wikipedia, Wikimedia Foundation, 7 Sept. 2025, en.wikipedia.org/wiki/Heinrich_Petri.










































































