Stars in Their Eyes: Art and Medieval Astronomy
After coming across a familiar-looking diagram of the planets in a 10th-century manuscript a few months ago, I asked my colleagues here at the British Library how cosmology was represented in some of the manuscripts on which they are currently working. The manuscripts they recommended offered a diverse array of ways to represent the planets and stars. Stargazing may have been a common human pastime throughout the ages, but how to depict the night sky was evidently another matter.
Christine and the Sybil pointing to a ladder from the heavens, from the Book of the Queen, France (Paris), c. 1410-1414, Harley MS 4431, f. 189v
Today, planets are often depicted with a diagram which shows their orbits as a series of concentric circles. This type of diagram may have ancient roots, stretching back to Greek philosophers and astronomers like Ptolemy and Heraclides. Such models illustrated excerpts from the Roman thinker Plinyâ€™s Natural History in some early medieval manuscripts. Over time, some copies were elaborated to take into account planetsâ€™ apparent retrogrades, leading to some spectacular models where planets are given overlapping or even zig-zagging paths. Diagrams using concentric circles were incorporated into medieval authors' works, too. Such a diagram illustrates a copy of Isidore of Sevilleâ€™s influential text, De Natura Rerum (On the Nature of Things), made in England in the 10th century. These diagrams reverse the positions of the Earth/moon and the sun, and some of the names of the planets are different from the names we use today, but otherwise they are largely recognizable to modern viewers.
Left: Diagram of the planets, from excerpts of Plinyâ€™s Natural History, France (Fleury), c. 990-1000, Harley MS 2506, f. 53r; Right: Diagram of the planetsâ€™ orbits, from Isidore of Sevilleâ€™s De Natura Rerum, England (St Augustineâ€™s Abbey, Canterbury?), Cotton MS Domitian A I, f. 23v.
In some cases, diagrams illustrating Pliny and other classical texts were also combined with theories attributed to Pythagoras about the relationship between musical tones, mathematical ratios and planets' orbits. Hence, a 9th-century diagram includes notes about tonus (tones) in between the planets. These diagrams could be rather elaborate, as in the 13th-century example below.
Diagram of the harmony of the planets, marked with names of Saturn, Jupiter, Mars, Mercury, Venus, the Sun, and the Moon, following a commentary on Ovid's Metamorphoses, France, c. 1225-1275, Burney MS 224, f. 191v
The concentric model was expanded in later medieval art to include the seven planets and the earth encircled by a layer of â€˜fixed starsâ€™ which was held up by angels. The elements of fire, air, water and earth were given their own layers, under the moon.
Circular diagram of the spheres of the Ptolemaic system, including the four elements, the seven planetary spheres, and the sphere of fixed stars, with four angels surrounding them, from MatfrÃ© Ermengau of BÃ©ziers's Breviari d'Amour, Spain (Gerona?), c. 1375-1400, Yates Thompson 31, f. 66r
Other depictions of the â€˜spheresâ€™ could be even more elaborate, with Hell at the centre and the throne of God at the outermost layer.
Full-page miniature of the Universe as a diagram formed of concentric circles, from Gautier de Metzâ€™s Lâ€™Image du monde, Low Countries (Bruges), 1464, Royal MS 19 A IX, f. 149r
But concentric circles were not the only way of depicting star systems in medieval manuscripts. By contrast, the model of the sun, moon and earth, from a 13th-century copy of Bedeâ€™s De temporibus, might look a bit alien to modern viewers.
Page from Bede's De temporibus illustrated with a diagram of the sun, moon, earth and planets, England, c. 1244, Egerton MS 3088 f. 17v
Earth is represented by a house-/ tomb-/ reliquary-shaped box at the bottom of the diagram, while the moon is labelled in a roundel above it. According to the annotations on the side, the other roundels include Mercury, Venus and other planets, all the way up to Saturn, â€˜in the 7th heavenâ€™. The diagram accompanies a passage explaining â€˜why the moon, though situated beneath the sun, sometimes appears to be above itâ€™ (translated by F. Wallis, Bede: The Reckoning of Time (Liverpool: Liverpool University Press, 1999), p. 77). While these diagrams look rather different from modern textbook representations of the sun, moon and earth, some of Bedeâ€™s text, updating to previous models of the universe, still stands. In particular, Bede is notable for being the first European to observe and record the connection between phases of the moon and the tides of the ocean.
Diagram of planetsâ€™ orbits, from a scientific miscellany, France or England, late 11th or 12th century, Royal MS 13 A XI, f. 143v
The diagram in a scientific miscellany made in the late 11th or early 12th century takes yet another approach, mapping planetsâ€™ orbits onto a sort of graph. The sunâ€™s regular appearance in the sky here contrasts with the other planetsâ€™ (and the moon's) more variable appearances over days, months and years.
Astrological drawing of the moon and Zodiac constellations, from a collection of astronomical and alchemical treatises, England, 16th century, Egerton MS 845, f. 21v
Other depictions of cosmology and the stars prioritised artistic creativity over mathematical calculations.
Two angels turning the axes of the world, from Matfre Ermengaud's Breviari d'amor, France (Toulouse?), mid-14th century, Harley MS 4940, f. 28r
Byzantine manuscripts provide some stunning examples of the planets as personified, depicted containing tiny portraits.
Planets, from the Theodore Psalter, Constantinople, February 1066, Add MS 19352, f. 135v
Like the concentric model, these personified models were also based on classical sources, which meant that these common themes emerged even in manuscripts produced in distant regions. For example, 11th-century manuscripts from as far apart as Constantinople and England depict the sun as a charioteer.
A personification of the rising sun, orbs of day and night, and a personification of the setting sun, from the Bristol Psalter, Eastern Mediterranean (Constantinople), 11th century, Add MS 40731, f. 80v
The chariots of the sun and the moon, from a scientific miscellany, Southern England, c. 1030-1060, Cotton MS Tiberius B V/1, f. 47r
Maps of the constellations were another way of representing the stars that was classically inspired and widespread in the Middle Ages: see our earlier blog post on Ciceroâ€™s â€˜map to the starsâ€™. Although the image of a night sky teeming with mythical monsters, ships and heroes contrasts with the model of orderly concentric orbits that began this post, we also use some of the same imagery of constellations today. See the similarities between an early medieval map of the constellations below and an advertisement for Air France which features in the British Libraryâ€™s exhibition on Maps and the 20th Century (on until 1 March 2017).
Map of the constellations of disputed origin, 9th or 11th-century, Northwestern Europe (Northern France? Low Countries? St Augustineâ€™s, Canterbury?), Harley MS 647, f. 21v
This is just a small sample of the ways the planets and stars were portrayed in medieval manuscripts. It does not even begin to touch on diagrams outlining specific celestial events, like eclipses, phases of the moon and zodiac cycles. Hopefully, however, this post gives a small taste of the myriad of ways medieval people thought about and depicted the heavens.
Men observing the stars, from Bartholomaeus Anglicus' De Proprietatibus rerum, Italy (Mantua), c. 1300-1310, Add MS 8785, f. 108v
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