thumb|Meteorologica, print of Latin translation in 1560
Meteorology (Greek: ; Latin: Meteorologica or Meteora) is a treatise by Aristotle. The text discusses what Aristotle believed to have been all the affections common to air and water, and the kinds and parts of the Earth and the affections of its parts. It includes early accounts of water evaporation, earthquakes, and other weather phenomena.
Aristotle's Meteorologica is the oldest comprehensive treatise on the subject of meteorology. Written around 340 B.C, it consists of four books; three pertaining to meteorology, and one to chemistry. Despite its ancient origins, Meteorologica was the basis for all modern day meteorology texts throughout Western Civilization up to the 17th century.
Throughout this treatise, Aristotle outlines two theories:
- The universe is spherical
- The Earth’s inner core is composed by the orbits of heavenly bodies
- The universe has two regions; the celestial (region past the Moon’s orbit) and the terrestrial region-sphere (the Moon’s tendency to orbit around the Earth)
- From this theory, Aristotle achieved a distinction between what was understood (astronomy) and his new findings (meteorology)
- The "Four-element Theory"
- The terrestrial region was composed of the four elements: water, earth, fire, and air
- These elements were arranged in spherical strata, with Earth as its center and the Moon on the outskirts of the sphere
- They were in constant interchange with one another, e.g: heat from the Sun collides with cold water, creating air and mist
Meteorologica does not only contain the theories of Ancient Greeks, but is the accumulation of the findings from poets, philosophers, historians, etc.
Throughout his treatise, Aristotle is methodical and consistent while presenting his findings. First, he introduces the topic by presenting the theories of other scholars. By refuting or supporting their claims, Aristotle shapes his own assertions. Scholars such as Anaxagoras derived many of their theories on inferences, strongly basing their discoveries on observations rather than fact. In comparison, Aristotle approached his research by drawing deductive inferences when examining his theories. While formulating his hypotheses, he preconceived his theories based on observed weather phenomena. In lieu of using weather observations to develop his findings, he interpreted these observations to support his hypotheses.
An Arabic compendium of Meteorology, called ' () and produced by the Antiochene scholar Yahya ibn al-Batriq, was widely circulated among Muslim scholars over the following centuries. This was translated into Latin by Gerard of Cremona in the 12th century – and by this means, during the Twelfth-century Renaissance, entered the Western European world of medieval scholasticism. Gerard's "old translation" (vetus translatio) was superseded by an improved text by William of Moerbeke, the nova translatio, which was widely read, as it survives in numerous manuscripts; it received commentary by Thomas Aquinas and was often printed during the Renaissance.
Physics
In On the Universe (a possibly spurious work), Aristotle writes:
This is a reference to the unmoved movers, a teleological explanation. Although On the Universe is included in the Corpus Aristotelicum, its status as a genuine Aristotelian text is disputed.
Four elements
All terrestrial matter consists of these four elements. Various ratios of the elements combine to create the diverse materials found in nature. Aristotle explains this in terms of the four primary contrary qualities, heat, cold, dryness, and moisture (Meteorology book 4 chapter 7); the first two being active causes and the latter being the underlying matter (378b10). Compositions of the elements in things like milk, blood, flesh, or metals will include both earth and water, and sometimes air. These composite bodies involve a form which combines contraries in the same body, i.e. both moisture and dryness (Aristotle explained the flexibility and ductility of metal by theorizing that it had moisture in its composition). They do so by forming proportions among the contraries. Flesh involves all four elements in a proportioned combination.
The theory of elements was meant to replace the Atomism of Democritus (which Aristotle refuted in On Generation and Corruption and De Caelo). The elements were not, therefore, tiny building blocks like atoms, but rather the constitutive properties (i.e. contraries) of the simple bodies (fire, air, water, earth) found in sense-perception.
Meteorology deals primarily with the interaction of three elements: air, water, and earth. A cloud is a composite that mixes all three. Books 1-3 of Meteorology apply a method of explanation (contrary qualities) which explains different phenomena as an interaction of forces in a natural system (relations of agent and patient, potency, and activity). Thus the sun and air are "movers" within meteorological phenomena, while water and earth are "moved" and act as matter. Book 4 is a sustained investigation of the properties and effects of heat and cold on organic processes. In "Meteorologica" (1, 2) in free translation as follows: "They boil the sea water and suspend large sponges from the mouth of a brass vessel to absorb what is evaporated, and after drawing the liquid from the sponges they find it to be sweet water." This is a practical application of Aristotle's theory of distillation and that the rain cycle is some sort of natural distallation, without having said the word (Book 1, Chapter 9).
Atmosphere
Water vapor
Weather
Aristotle describes the properties of tornadoes and lightning.
Geology
Geography
Hydrology
Spherical Earth
Aristotle is describing a spherical lithosphere (Earth), hydrosphere (water) and atmosphere (air and fire).
Book 1
The following is the table of contents of the first book:
Ch. 1 Introduction to meteorology
Ch.2 General principles and elements in relation to the world and universe
Ch.3 Composition of the four elements; air, earth, fire, and water. Topics also include the composition of the space between moon and stars, the double nature of exhalation, and the composition of clouds. This chapter also contains Anaxagoras' analysis of the element ether
Ch.4 Shooting Stars
Ch.5 The Aurora Borealis and its affects
Ch.6 Comets, including the analyses of Anaxagoras, Democritus, the Pythagoreans. Refutation of these findings by Hippocrates of Chios and Aeschylus
Ch.7 Comets, their nature and causes
Ch.8 The Milky Way, including Aristotle's new theory
Ch.9 The formation of rain, mist, and clouds
Ch.10 Dew and hoar-frost
Ch.11 Rain, snow, hail and their connection to hoar-frost
Ch.12 Hail, why it occurs in the summer and disputing Anaxagoras' theories
Ch.13 Winds, formation of rivers
Ch.14 Climatic changes and coast erosion
Book 2
The following is the table of contents of the second book:
Ch. 1 The ocean and its nature
Ch.2 & Ch.3 Sea saltiness and its origins
Ch.4 Winds, their causes and effects
Ch.5 Winds, effects of heat and cold on winds
Ch.6 Winds and their directions
Ch.7 Earthquakes, and the views and contradictions of Anaxagoras, Democritus, and Anaximenes
Ch.8 Earthquakes and their causes
Ch.9 Thunder and lightning, causes and theories from Empedocles and Anaxagoras
Book 3
The following is the table of contents of the third book:
Ch. 1 Hurricanes, typhoons, fire winds and thunderbolts
Ch.2 Haloes and rainbows
Ch.3 Haloes and their shapes
Ch.4 Rainbows and their forms
Ch.5 Rainbows continued
Ch.6 Mock suns and rods
Book 4
The authorship of the fourth book is disputed. This is due partially to its content. It deals with an altogether different set of questions from the other three books, and is much more similar to On Generation and Corruption. According to H. B. Gottschalk: Recently, its authenticity, or at the very least, its consistency with other Aristotelian texts, has been defended. Where exactly it should be placed in the corpus is another question. Alexander placed it with GC (On Generation and Corruption), but thought it was a different work from it. Olympiodorus placed it between Cael. (De Caelo, On the Heavens) and GC, while Patrizi placed it before Parts of Animals. Only Ammonius claims it is both genuine and in the right place.