By Paul Lettinck

An account of what students have written at the matters handled in Aristotle's "Meteorology", this paintings investigates how they have been stimulated via each other and via past Greek commentators. for every topic a survey is given of the content material of the commentaries in addition to of later treatise.

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Additional info for Aristotle's Meteorology and Its Reception in the Arab World: With an Edition and Translation of Ibn Suwār's Treatise on Meteorological Phenomena and Ibn Bājja's Commentary on the Meteorology (Aristoteles Semitico-Latinus)

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Simultaneously, but independently, the same was found in the West by Dietrich von Freiberg. The quantitative calculation that explains the radius of the rainbow and an explanation of the colours would later be given by Descartes and Newton. 10. Exhalations within the earth; Book IV of the Meteorology Aristotle concludes the discussion of phenomena that arise due to the exhalations with some remarks on what is formed within the earth: if dry exhalation affects earthy matter, then minerals like stones, sulphur, etc.

When Aristotle introduces the exhalations in 1,4, he states that the solar heat dissolves from the earth two exhalations (άναθυμίαοις), a vapourous (άιμιδώδης) exhalation from the water on and within the earth, and a windy (πνευματώδης), smoky (καπνώδης) exhalation from the earth itself. The former is moist, the latter is dry and hot. The exhalations move upward; the windy exhalation, being hot, rises above the heavier vapour. The sublunar stratum adjacent to the celestial sphere is filled with the hot, dry exhalation, and this what we call fire; it is an inflammable material (ύπέκκαυμα), which is easily ignited.

Hot, dry exhalation, when it rises together with vapour, may be caught in the cooling vapour when it becomes a cloud. When the cloud condenses, the hot exhalation is ejected and strikes against the surrounding clouds, thereby producing a noise, which is thunder. The ejected exhalation usually becomes inflamed and this is lightning. A hurricane is a wind that emerges from a cloud, similar to the wind that causes thunder; the difference is that in the case of a hurricane the wind forms a denser and more compact body.

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