Geographischer und astrologischer Zonenbegriff in der Antike

The five (or seven) zones are treated during Greek‐Roman antiquity in geography and theoretical astrology as well. Although there is no use of them in astrological prognostication, they occur in the ascending scale of the twelve planetary houses. The common planetary order (moon ‐ Mercury ‐Venus ‐ sun ‐ Mars ‐ Jupiter ‐ Saturn) owes its widespread success primarily to its symmetry on both sides of the central sun, but the twofold vertical mesotes‐pattern in the heaven seems to be invented according to the horizontal symmetry of the five geographical zones surrounding the terrestrial equator.     

Erfahrung und Vorurteil im naturwissenschaftlichen Denken Johannes Keplers

The change from ancient and medieval to modern natural science, called Wende (instead of ‘revolution’), must be associated with the work of Johannes Kepler and not that of Nicolaus Copernicus. Copernicus merely showed the way, introducing heliocentricity as the order of the planets. This Wende resulted from the synthesis of several disciplines formerly isolated from each other, namely mathematical (i.e. hypothetical) astronomy, new physics, mathematical harmony, astrology, new physical optics, and natural theology. Whereas Copernicus united mathematical astronomy and peripatetic (Aristotelian) physics, Kepler was first to see the necessity for providing a physical explanation and an ontological foundation to the heliocentric system. He was the first to consider and measure the movement of the planets in depth. The elements for his new physics Kepler obtained not from newly observed data, but from a harmonic archetypus of the regular polyhedra fitted in between excentric planetary spheres. On the basis of this archetypus (which he considered to be God's model in creating the universe) he accepted the new heliocentric planetary system as a physical reality. That is why astronomy, by way of taking into account stereometric quantities, is, in Kepler's eyes, a kind of divine worship. Later, the best empirical data had also to be taken into consideration as a means of proving this a priori archetypus (Vorurteil, preconception). The result was, on the one hand, a universal natural science able to explain natural processes in grater abundance than ever before or since in the history of science. Although accepted only in parts, it resulted in founding a new natural science with adherent mathematical and empirical methods. It also led Kepler to establish, step by step, the elliptical path of the planets, thereby overcoming, for the first time, the two axioms of ancient astronomy, requiring uniform and circular planetary motion. It has been shown that this Keplerian Wende was possible only within the Historischen Erfahrungsraum (‘historical field of experience’) of Renaissance Humanism (cf. this Journal 9/1986, p. 201), which came about itself as the result of reactivating the scientific and philosophical thinking of the ancient Greeks and was accomplished by three steps (phases) relating to the revival of (1) original ancient writings, (2) the ancient knowledge of natural facts and data, and (3) the ancient scientific and philosophical ideas and mentalities (Drei-Phasen-Modell).     

Die Astrologie der Antike

This survey of classical astrology is in three parts: a) a summary of its rich and eventful history from the Babylonians to the Renaissance; b) the methods of calculation which remained the same throughout the period, based on the planets, the zodiac and the “twelve houses”; c) an analysis of astrological thought, which is quite different from any modern approach; providing a rigid interpretation of the universe, it granted confort and security. It presents a curious combination of religion and science: the physics is the one forwarded by the stoïcs, with an equal balance of the four elements, and the microcosmic economy within the soul representing the macrocosmic one; but such a determinism is in contradiction with the Stoics' sense of responsability which presupposes free will.