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| | CATHOLIC ENCYCLOPEDIA: History of Physics |
 | | About 1134 John of Luna translated Al-Fergâni's treatise "Astronomy", which was an abridgement of the "Almagest", thereby introducing Christians to the Ptolemaic system, while at the same time his translations, made in collaboration with Gondisalvi, familiarized the Latins with the physical and metaphysical doctrines of Aristotle. |
| | Kepler himself admitted that in his first attempts along the line of celestial mechanics he was under the influence of Nicholas of Cusa and Gilbert. |
| | In Kepler's earliest system, as in Gilbert's, the distant sun was said to exercise over each planet a power perpendicular to the radius vector, which power produced the circular motion of the planet. |
| www.newadvent.org /cathen/12047a.htm (15144 words) |
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