in tow with the advent of personal psychology. Earlier, astrology was practiced for nations, leaders, celebrities, omens, wars and welfare, or for past, present and future dates or events such as solstices and eclipses.
Up until the nineteenth century, our solar system was known to include only the planets up to Saturn. Ancient astrologers were the astronomers of yore and devised an interpretative system for the meaning of the planetary locations and interactions. Hence, just as alchemists were the forerunners of modern chemistry, astrologers were de facto the astronomers in times past. Yet, just as the chemists separated out from the alchemists, the astronomers parted ways with the astrologers.
The astronomers were concerned with the precise, tangible science of celestial mechanics, coming to renounce any interpretative arts, for lack ofobservable locations of these within the twelve zodiac constellations, but rather under the factitious practice of assigning each zodiac xe2x80x9csignxe2x80x9d with one-twelfth (30xc2x0) of the ecliptic (360xc2x0), beginning on the vernal equinox as Aries 0xc2x0, then Taurus at 30xc2x0, then Gemini, Cancer, Leo, Virgo, Libra, Scorpio, Sagittarius, Capricorn, Aquarius and concluding in Pisces, irrespective of the physical zodiac constellations.
Western, tropical, astrology was institutionalized through conditions, conventions and data dating to Ptolemy (c. 90 ADxe2x80x94c. 168 AD) and to Hipparchus (fl. c. 146 BCxe2x80x94127 BC). Considered the greatest astronomer until Copernicus, Hipparchus provided detailed and exact mappings of star positions and constellations, completed in 129 BC (this is one date used to estimate precession herein), and discovered the phenomenon, the xe2x80x9cprecession of the equinoxesxe2x80x9d, a 26,000-year cycle. His catalogue