02-03-2026, 08:04 AM
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"...Kepler adopted the original five Ptolemy had espoused, in additional to eight more. The aspect known as conjunction occurred when one planet obscured another along the circumference (0°), while that of opposition occurred when two planets were situated opposite one another (180°). The next aspect was that of quartile, produced when two planets marked off 90° along the arc of the circle. The final two aspects were known as trine and sextile, respectively formed by the displacement of two planets by 120° and 60°. Compelling evidence in the form of extensive weather observations had led Kepler to consider the eight additional aspects ranked in order of descending influence: Octile (45°), trioctile (135°), semisextile (30°), quincunx (150°), quintile (72°), tridecile (108°), biquintile(144°) and decile (36°). Each of these angular displacements corresponded to the measurement of a side of a constructible polygon inscribed in a circle. The potential influence of each configuration was a consequence of its geometrical properties as deduced by Kepler..."
Boner, P. J., Soul-searching with Kepler: an analysis of anima in his astrology, Journal for the History of Astronomy, 36(1), 7-20, 2005. Available: You are not allowed to view links. Register or Login to view.
"...Kepler adopted the original five Ptolemy had espoused, in additional to eight more. The aspect known as conjunction occurred when one planet obscured another along the circumference (0°), while that of opposition occurred when two planets were situated opposite one another (180°). The next aspect was that of quartile, produced when two planets marked off 90° along the arc of the circle. The final two aspects were known as trine and sextile, respectively formed by the displacement of two planets by 120° and 60°. Compelling evidence in the form of extensive weather observations had led Kepler to consider the eight additional aspects ranked in order of descending influence: Octile (45°), trioctile (135°), semisextile (30°), quincunx (150°), quintile (72°), tridecile (108°), biquintile(144°) and decile (36°). Each of these angular displacements corresponded to the measurement of a side of a constructible polygon inscribed in a circle. The potential influence of each configuration was a consequence of its geometrical properties as deduced by Kepler..."
Boner, P. J., Soul-searching with Kepler: an analysis of anima in his astrology, Journal for the History of Astronomy, 36(1), 7-20, 2005. Available: You are not allowed to view links. Register or Login to view.
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