On the Sun and Light

...extinguishes none in many regions. Furthermore, the annual fortune of the entire world always depends upon the entry of the Sun into Aries The Spring Equinox, traditionally the start of the astrological year. And from this point, indeed, the nature of Spring properly begins. From the entry of the Sun into Cancer, the quality of Summer is judged. From the entry into Libra, the nature of Autumn. From the approach into Capricorn, the quality of Winter is found. This is discovered, evidently, by the present figure of the heavens everywhere. Deservedly, since time depends upon motion, the Sun distinguishes the four seasons of the year through the four moveable signs Also known as Cardinal signs: Aries, Cancer, Libra, and Capricorn. Likewise, from the return of the Sun to the exact degree and minute of each person's birth, a varying fortune for each individual revolves throughout the year This refers to the "Solar Return," a practice in horoscopic astrology used to predict the year ahead. Added to this is the fact that the motion of the Sun—as the first and chief of the planets (as Aristotle says)—is the most simple, neither departing from the middle of the Zodiac The Ecliptic like the others, nor ever moving backward The Sun and Moon are the only "planets" in the ancient system that never undergo retrograde motion.

Chapter 4: The conditions of the planets in relation to the Sun.

Likewise, certain fixed and defined spaces in the heavens are seen everywhere to be determined by the Sun itself. When the planets have first traversed these, they change their motion and condition. For Saturn, Jupiter, and Mars, upon reaching a trine aspect original: "conspectum trinum"; an astrological aspect where planets are 120 degrees apart in the third part of the sky from the Sun, immediately change their motion and move either forward or backward. If they are oriental rising before the Sun from the Sun, they move backward retrograde: the apparent backward motion of a planet as seen from Earth; if they are occidental setting after the Sun, they move forward. Venus and Mercury, however...