Astronomical Lore in Chaucer

in the M

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 ac

s. 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 accordi

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 Pto

eek 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

s 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 participate 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

ained 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 o

l astronomy and produced no new school of astronomy. Although it was the fashion 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, ap

erest 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 method

the facilities for observation then available; and not because it was founded upon the false assumption 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

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 ab

m root among the patient scholars of the monasteries, and slowly but steadily the geocentric system of cosmology was making its

ture, 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 preces

ons 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