: Astronomical Lore in Chaucer by Grimm Florence M Florence Marie - Chaucer Geoffrey -1400 Knowledge Astronomy; Astronomy Medieval in literature

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Appendix 79

ASTRONOMICAL LORE IN CHAUCER

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 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 God 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.

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 assign 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.

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.

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.

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.

CHAUCER'S SCIENTIFIC KNOWLEDGE

CHAUCER'S COSMOLOGY

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.

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