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 shines 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_