Astronomical Lore in Chaucer Part 1

Astronomical Lore in Chaucer.

by Florence M. Grimm.

I

ASTRONOMY IN THE MIDDLE AGES

The conspicuousness of astronomical lore in the poetry of Chaucer is due to its importance in the life of his century. In the mediaeval period, astronomy (or 'astrology,' for the two names were used indifferently to cover the same subject) was one of the vital interests of men. The ordinary man of the Middle Ages knew much more than do most men to-day about the phenomena of the heavens; conveniences such as clocks, almanacs, and charts representing celestial phenomena were rare, and direct observations of the apparent movements and the relative positions of the heavenly bodies were necessary for the regulation of man's daily occupations. Furthermore, the belief in a geocentric system of the universe, which in Chaucer's century was almost universally accepted, was of vast significance in man's way of thinking. Accepting this view, all the heavenly bodies seemed to have been created for the sole benefit of man, inhabiting the central position in the universe; their movements, always with reference to the earth as a center, brought to man light, heat, changes of season--all the conditions that made human life possible on the earth.

Not only did the man of the Middle Ages see in the regular movements of the celestial spheres the instruments by which G.o.d granted him physical existence, but in the various aspects of heavenly phenomena he saw the governing principles of his moral life. The arrangement of the heavenly bodies with regard to one another at various times was supposed to exert undoubted power over the course of terrestrial events. Each planet was thought to have special attributes and a special influence over men's lives. Venus was the planet of love, Mars, of war and hostility, the sun, of power and honor, and so forth. Each was mysteriously connected with a certain color, with a metal, too, the alchemists said, and each had special power over some organ of the human body. The planet's influence was believed to vary greatly according to its position in the heavens, so that to determine a man's destiny accurately it was necessary to consider the aspect of the whole heavens, especially at the moment of his birth, but also at other times. This was called "casting the horoscope" and was regarded as of great importance in enabling a man to guard against threatening perils or bad tendencies, and to make the best use of favorable opportunities.

It is not astonis.h.i.+ng, then, that the great monuments of literature in the mediaeval period and even much later are filled with astronomical and astrological allusions; for these are but reflections of vital human interests of the times. The greatest poetical work of the Middle Ages, Dante's _Divina Commedia_, is rich in astronomical lore, and its dramatic action is projected against a cosmographical background reflecting the view of Dante's contemporaries as to the structure of the world. Milton, writing in the seventeenth century, bases the cosmology of his _Paradise Lost_ in the main on the Ptolemaic system, but makes Adam and the archangel Raphael discuss the relative merits of this system and the heliocentric view of the universe. The latter had been brought forth by Copernicus a century earlier, but even in Milton's day had not yet succeeded in supplanting the old geocentric cosmology.

The view of the universe which we find reflected in Chaucer's poetry is chiefly based on the Ptolemaic system of astronomy, though it shows traces of very much more primitive cosmological ideas. The Ptolemaic system owes its name to the famous Alexandrian astronomer of the second century A. D., Claudius Ptolemy, but is based largely on the works and discoveries of the earlier Greek philosophers and astronomers, especially Eudoxus, Hipparchus, and Aristarchus, whose investigations Ptolemy compiled and, along some lines, extended. Ptolemaic astronomy was a purely geometrical or mathematical system which represented the observed movements and relative positions of the heavenly bodies so accurately that calculations as to their positions at any given time could be based upon it. Ptolemy agreed with his contemporaries in the opinion that to a.s.sign causes for the celestial movements was outside the sphere of the astronomer. This was a proper field of philosophy; and the decisions of philosophers, especially those of Aristotle, were regarded as final, and their teaching as the basis upon which observed phenomena should be described.

According to the Ptolemaic system the earth is a motionless sphere fixed at the center of the universe. It can have no motion, for there must be some fixed point in the universe to which all the motions of the heavenly bodies may be referred; if the earth had motion, it was argued, this would be proportionate to the great ma.s.s of the earth and would cause objects and animals to fly off into the air and be left behind. Ptolemy believed this reason sufficient to make untenable the idea of a rotatory motion of the earth, although he was fully aware that to suppose such a motion of the earth would simplify exceedingly the representations of the celestial movements. It did not occur to him that to suppose the earth's atmosphere to partic.i.p.ate in its motion would obviate this difficulty. The earth was but a point in comparison with the immense sphere to which the stars were attached and which revolved about the earth once in every twenty-four hours, imparting its motion to sun, moon, and planets, thus causing day and night and the rising and setting of the heavenly bodies. The irregular motions of the planets were accounted for by supposing them to move on circles of small spheres called 'epicycles', the centres of which moved around the 'deferents', or circles of large spheres which carried the planets in courses concentric to the star sphere. By giving each of the planets an epicycle and deferent of the proper relative size and velocity the varied oscillations of the planets, as far as they could be followed by means of the simple instruments then in use, were almost perfectly accounted for.

Though it was a purely mathematical system which only attempted to give a basis for computing celestial motions, Ptolemaic astronomy is of great importance historically as it remained the foundation of theoretical astronomy for more than 1400 years. Throughout the long dark centuries of the Middle Ages it survived in the studies of the retired students of the monasteries and of the few exceptionally enlightened men who still had some regard for pagan learning in the days when many of the Church Fathers denounced it as heretical.

Ptolemy was the last of the great original Greek astronomers. The Alexandrian school produced, after him, only copyists and commentators, and the theoretical astronomy of the Greeks, so highly perfected in Ptolemy's _Almagest_, was for many centuries almost entirely neglected.

The Roman State gave no encouragement to the study of theoretical astronomy and produced no new school of astronomy. Although it was the fas.h.i.+on for a Roman to have a smattering of Greek astronomy, and famous Latin authors like Cicero, Seneca, Strabo and Pliny wrote on astronomy, yet the Romans cared little for original investigations and contributed nothing new to the science. The Romans, however, appreciated the value of astronomy in measuring time, and applied to the Alexandrian school to satisfy their practical need for a calendar. What Julius Caesar obtained from the Alexandrian Sosigenes, he greatly improved and gave to the Empire, as the calendar which, with the exception of the slight change made by Gregory XIII, we still use.

The pseudo-astronomical science of astrology, or the so-called 'judicial astronomy' was pursued during the Roman Empire and throughout the Middle Ages with much greater zeal than theoretical astronomy. The interest in astrology, to be sure, encouraged the study of observational astronomy to a certain extent; for the casting of horoscopes to foretell destinies required that the heavenly bodies be observed and methods of calculating their positions at any time or place be known. But there was no desire to inquire into the underlying laws of the celestial motions or to investigate the real nature of the heavenly phenomena.

If the Roman State did not encourage astronomy, the Roman Church positively discouraged it. The Bible became and long remained the sole authority recognized by the Church Fathers as to the const.i.tution of the universe. By many of the Patristics Ptolemaic astronomy was despised; not because it did not describe accurately the observed phenomena of the heavens, for it did this in a way that could scarcely have been improved upon with the facilities for observation then available; and not because it was founded upon the false a.s.sumption that the earth is the motionless center of the universe about which all heavenly bodies revolve; but because there was no authority in Scripture for such a system, and it could not possibly be made consistent with the cosmology of Genesis.

Allegorical descriptions of the universe based on the Scriptures held almost complete sway over the mediaeval mind. The whole universe was represented allegorically by the tabernacle and its furniture. The earth was flat and rectangular like the table of shew bread, and surrounded on all four sides by the ocean. The walls of heaven beyond this supported the firmament shaped like a half-cylinder. Angels moved the sun, moon, and stars across the firmament and let down rain through its windows from the expanse of water above.

By no means all of the early Church Fathers were wholly without appreciation of the fruits of Greek astronomical science. Origen and Clement of Alexandria, while believing in the scriptural allegories, tried to reconcile them with the results of pagan learning. In the West, Ambrose of Milan and later Augustine, were at least not opposed to the idea of the earth's sphericity, and of the existence of antipodes, although they could not get away from the queer notion of the waters above the firmament. A few enlightened students like Philoponus of Alexandria, Isidore of Seville, the Venerable Bede, and Irish scholars like Fergil and Dicuil, studied the Greek philosophers and accepted some of the pagan scientific teachings.

Fortunately the study of those ancient Latin writers whose works had preserved some of the astronomy of the Greeks had taken firm root among the patient scholars of the monasteries, and slowly but steadily the geocentric system of cosmology was making its way back into the realm of generally accepted fact, so that by the ninth century it was the system adopted by nearly all scholars.

About the year 1000 began the impetus to learning which culminated in the great revival of the Renaissance. One cause of this intellectual awakening was the contact of Europe with Arab culture through the crusades and through the Saracens in Sicily and the Moors in Spain. The Arabian influence resulted in an increased sense of the importance of astronomy and astrology; for, while the scholars of the Christian world had been devising allegorical representations of the world based on sacred literature, the Arabian scholars had been delving into Greek science, translating Ptolemy and Aristotle, and trying to make improvements upon Ptolemaic astronomy. The spheres of the planets, which Ptolemy had almost certainly regarded as purely symbolical, the Arabs conceived as having concrete existence. This made it necessary to add a ninth sphere to the eight mentioned by Ptolemy; for it was thought sufficient that the eighth sphere should carry the stars and give them their slow movement of precession from west to east. This ninth sphere was the outermost of all and it originated the "prime motion" by communicating to all the inner spheres its diurnal revolution from east to west. In mediaeval astronomy it came to be known as the _primum mobile_ or "first movable," while a tenth and motionless sphere was added as the abode of G.o.d and redeemed souls. The sun and moon were included among the planets, which revolved about the earth in the order Moon, Mercury, Venus, Sun, Mars, Jupiter, Saturn.

At first the astronomy taught in the universities was based on Latin translations of Arabic commentaries and paraphrases of Aristotle, which had made their way into Europe through the Moors in Spain. For several centuries Aristotle represented in the eyes of most scholastics "the last possibility of wisdom and learning." But by the middle of the thirteenth century Ptolemy began to be rediscovered. The Ptolemaic system of planetary motions was briefly described in a handbook compiled by John Halifax of Holywood, better known as Sacrobosco. Roger Bacon wrote on the spheres, the use of the astrolabe, and astrology, following Ptolemy in his general ideas about the universe. The great mediaeval scholar and philosopher, Thomas Aquinas, was also familiar with the Ptolemaic system; but to most of the men of the thirteenth century Ptolemy's works remained quite unknown. The real revival of Greek astronomy took place in the fourteenth century when scholars began to realize that new work in astronomy must be preceded by a thorough knowledge of the astronomy of the Alexandrian school as exhibited in the _Syntaxis_ of Ptolemy. It was then that Greek and Latin ma.n.u.scripts of works on astronomy began to be eagerly sought for and deciphered, and a firm foundation constructed for the revival of theoretical astronomy.

II

CHAUCER'S SCIENTIFIC KNOWLEDGE

It was in the fourteenth century that Chaucer lived and wrote, and his interest in astronomical lore is, therefore, not surprising. Although the theories of astronomy current in Chaucer's century have been made untenable by the _De Revolutionibus...o...b..um_ of Copernicus, and by Kepler's discovery of the laws of planetary motion; although the inaccurate and unsatisfactory methods of astronomical investigation then in use have been supplanted by the better methods made possible through Galileo's invention of the telescope and through the modern use of spectrum a.n.a.lysis; yet, of all scientific subjects, the astronomy of that period could most nearly lay claim to the name of science according to the present acceptation of the term. For, as we have seen, the interest in astrology during the Middle Ages had fostered the study of observational astronomy, and this in turn had furnished the science a basis of fact and observation far surpa.s.sing in detail and accuracy that of any other subject.

Practically all of Chaucer's writings contain some reference to the movements and relative positions of the heavenly bodies, and to their influence on human and mundane affairs, and in some of his works, especially the treatise on _The Astrolabe_, a very technical and detailed knowledge of astronomical and astrological lore is displayed. There is every reason to suppose that, so far as it satisfied his purposes, Chaucer had made himself familiar with the whole literature of astronomical science. His familiarity with Ptolemaic astronomy is shown in his writings both by specific mention[1] of the name of Ptolemy and his _Syntaxis_, commonly known as the 'Almagest,' and by many more general astronomical references.

Even more convincing evidence of Chaucer's knowledge of the scientific literature of his time is given in his _Treatise on the Astrolabe_.

According to Skeat, Part I and at least two-thirds of Part II are taken, with some expansion and alteration, from a work on the Astrolabe by Messahala[2], called, in the Latin translation which Chaucer used, "Compositio et Operatio Astrolabie." This work may have been ultimately derived from a Sanskrit copy, but from Chaucer's own words in the _Prologue to the Astrolabe_[3] it is clear that he made use of the Latin work. The rest of Part II may have been derived from some general compendium of astronomical and astrological knowledge, or from some other of the treatises on the Astrolabe which Chaucer says were common in his time.[4]

Other sources mentioned by Chaucer in _The Astrolabe_ are the calendars of John Some and Nicholas Lynne, Carmelite friars who wrote calendars constructed for the meridian of Oxford[5]; and of the Arabian astronomer Abdilazi Alkabucius.[6] In _The Frankeleyns Tale_ Chaucer mentions the Tabulae Toletanae,[7] a set of tables composed by order of Alphonso X, king of Castile, and so called because they were adapted to the city of Toledo. Works which served Chaucer not as sources of information on scientific subjects but as models for the treatment of astronomical lore in literature were the _De Consolatione Philosophiae_ of Boethius, which Chaucer translated and often made use of in his poetry; and the works of Dante, whose influence on Chaucer, probably considerable, has been pointed out by several writers, notably Rambeau[8] who discusses the parallels between _The Hous of Fame_ and the _Divina Commedia_.

III

CHAUCER'S COSMOLOGY

Chaucer wrote no poetical work having a cosmographical background as completely set forth as is that in Dante's _Divine Comedy_ or that in Milton's _Paradise Lost_. Although his cosmological references are often incidental they are not introduced in a pedantic manner. Whenever they are not parts of interpolations from other writers his use of them is due to their intimate relation to the life his poetry portrays or to his appreciation of their poetic value. When Chaucer says, for example, that the sun has grown old and s.h.i.+nes in Capricorn with a paler light than is his wont, he is not using a merely conventional device for showing that winter has come, but is expressing this fact in truly poetic manner and in words quite comprehensible to the men of his day, who were accustomed to think of time relations in terms of heavenly phenomena.

Popular and scientific views of the universe in Chaucer's century were by no means the same. The untaught man doubtless still thought of the earth as being flat, as it appears to be, as bounded by the waters of the ocean, and as covered by a dome-like material firmament through which the waters above sometimes came as rain; while, as we have seen, by the fourteenth century among scholars the geocentric system of astronomy was firmly established and the spheres and epicycles of Ptolemy were becoming more widely known. It is the view held by the educated men of his century that Chaucer's poetry chiefly reflects.

1. _The Celestial Spheres and their Movements_

When we read Chaucer we are transported into a world in which the heavenly bodies and their movements seem to bear a more intimate relation to human life than they do in the world in which we live. The thought of the revolving spheres carrying sun, moon, and planets, regulating light and heat on the earth, and exercising a mysterious influence over terrestrial events and human destiny was a sublime conception and one that naturally appealed to the imagination of a poet. Chaucer was impressed alike by the vastness of the revolving spheres in comparison to the earth's smallness, by their orderly arrangement, and by the unceasing regularity of their appearance which seemed to show that they should eternally abide. In the _Parlement of Foules_ he interpolates a pa.s.sage from Cicero's _Somnium Scipionis_ in which Africa.n.u.s appears to the sleeping Scipio, points out to him the insignificance of our little earth when compared with the vastness of the heavens and then admonishes him to regard the things of this world as of little importance when compared with the joys of the heavenly life to come.[9]

"Than shewed he him the litel erthe, that heer is, At regard of the hevenes quant.i.te; And after shewed he him the nyne speres."

The regular arrangement of the planetary spheres clings often to the poet's fancy and he makes many allusions to their order in the heavens. He speaks of Mars as "the thridde hevenes lord above"[10] and of Venus as presiding over the "fifte cercle."[11] In _Troilus and Criseyde_ the poet invokes Venus as the adorning light of the third heaven.[12]

"O blisful light, of which the bemes clere Adorneth al the thridde hevene faire!"[13]

Mediaeval astronomers as we have seen, imagined nine spheres, each of the seven innermost carrying with it one of the planets in the order mentioned below; the eighth sphere was that of the fixed stars, and to account for the precession of the equinoxes, men supposed it to have a slow motion from west to east, round the axis of the zodiac; the ninth or outermost sphere they called the _primum mobile_, or the sphere of first motion, and supposed it to revolve daily from east to west, carrying all the other spheres with it. The thought of the two outer spheres, the _primum mobile_, whirling along with it all the inner spheres, and the firmament, bearing hosts of bright stars, seems to have appealed strongly to the poet's imagination. In the _Tale of the Man of Lawe_ the _primum mobile_ is described as crowding and hurling in diurnal revolution from east to west all the spheres that would naturally follow the slow course of the zodiac from west to east.[14] Elsewhere the _primum mobile_ is called the "whele that bereth the sterres" and is said to turn the heavens with a "raviss.h.i.+ng sweigh:"

"O thou maker of the whele that bereth the sterres, which that art y-fastned to thy perdurable chayer, and tornest the hevene with a raviss.h.i.+ng sweigh, and constreinest the sterres to suffren thy lawe;"[15]

The firmament, which in Chaucer is not restricted to the eighth sphere but generally refers to the whole expanse of the heavens, is many times mentioned by Chaucer; and its appearance on clear or cloudy nights, its changing aspects before an impending storm or with the coming of dawn, beautifully described.[16]

2. _The Harmony of the Spheres_

Some of the cosmological ideas reflected in Chaucer's writings can be traced back to systems older than the Ptolemaic. The beautiful fancy that the universe is governed by harmony had its origin in the philosophy of the Pythagoreans in the fourth century B. C., and continued to appeal to men's imagination until the end of the Middle Ages. It was thought that the distances of the planetary spheres from one another correspond to the intervals of a musical scale and that each sphere as it revolves sounds one note of the scale. When asked why men could not hear the celestial harmony, the Pythagoreans said: A blacksmith is deaf to the continuous, regular beat of the hammers in his shop; so we are deaf to the music which the spheres have been sending forth from eternity.

In ancient and mediaeval cosmology it was only the seven spheres of the planets that were generally supposed to partic.i.p.ate in this celestial music; but the poets have taken liberties with this idea and have given it to us in forms suiting their own fancies. Milton bids all the celestial spheres join in the heavenly melody:

"Ring out, ye crystal spheres, Once bless our human ears, If ye have power to touch our senses so; And let your silver chime Move in melodious time, And let the base of heaven's deep organ blow; And with your ninefold harmony, Make up full consort to the angelic symphony."[17]

Shakespeare lets every orb of the heavens send forth its note as it moves:

"There's not the smallest orb which thou behold'st But in his motion like an angel sings, Still quiring to the young-eyed cherubins;"[18]

Chaucer, too, makes all nine spheres partic.i.p.ate: