Posted: Thu Apr 30, 2015 4:18 am
Deb, I assume you have been drawing material from Geminos' Instroduction to the Phenomena? Please correct me if I'm wrong.
Aratus' Phenomena was a practical manual in verse to teach the reader to identify constellations and predict weather according to Aaron Poochigian who recently translated the text. (John Hopkins University Press, 2010) The Phenomena was not an astrological text. Geminos's Introduction to the Phenomena is subtitled by the authors A Translation and Study of a Hellenistic Survey of Astronomy. (Translated by James Evans and J. Lennart Berggren, Princeton University Press, 2006) This introduction also isn't primarily an astrological text, but rather an astronomical compendium.
What seems to have happened (based on my limited understanding) is that for astronomical purposes the zodiac became linked to the equinoxes and solstices from a particular early date, but astrologers continued to use a sidereal zodiac related to the stars. Based on existing horoscopes that have survived to our time, they followed their Babylonian precursors in that regard.
Ptolemy himself was an astronomer, mathematician, and geographer, but not a fully practicing astrologer as Valens apparently was. There are even questions as to whether Ptolemy was an astrologer at all. So my perspective is that early astronomy became mixed up with astrological principles. Thus, the birth of the astrologers' tropical zodiac.
Aratus' Phenomena was a practical manual in verse to teach the reader to identify constellations and predict weather according to Aaron Poochigian who recently translated the text. (John Hopkins University Press, 2010) The Phenomena was not an astrological text. Geminos's Introduction to the Phenomena is subtitled by the authors A Translation and Study of a Hellenistic Survey of Astronomy. (Translated by James Evans and J. Lennart Berggren, Princeton University Press, 2006) This introduction also isn't primarily an astrological text, but rather an astronomical compendium.
What seems to have happened (based on my limited understanding) is that for astronomical purposes the zodiac became linked to the equinoxes and solstices from a particular early date, but astrologers continued to use a sidereal zodiac related to the stars. Based on existing horoscopes that have survived to our time, they followed their Babylonian precursors in that regard.
Ptolemy himself was an astronomer, mathematician, and geographer, but not a fully practicing astrologer as Valens apparently was. There are even questions as to whether Ptolemy was an astrologer at all. So my perspective is that early astronomy became mixed up with astrological principles. Thus, the birth of the astrologers' tropical zodiac.

