Hellenistic astrology was practiced from 2nd century BCE until around the 7th century CE and is the combination of the Babylonian observations of the stars & the Egyptian tradition of decanic astrology.
When Europe entered the Middle Ages, astrology was then passed to and further developed in the Islamic world from 7th to the 13th century. Followed then by Renaissance astrology back in Europe.
A lot of knowledge has been lost through the centuries and got reinvented in the 19th century giving birth to psychological astrology and other branches.
Until the beginning of 1990 when project Hindsight was created and the translation of ancient Greek and Latin astrological text to English began, followed by the translation of Arabic astrological sources. They recovered and recalled the great Art and Nobility of Ancient Astrology.
The main difference between modern and ancient astrology is that modern astrology has psychological and focuses on the inner world, and traditional astrology has a fate focus. Ultimately astrology will guide you to the path of self-knowledge & awareness.
At the Arts of Astrology, we use the 7 traditional planets, (and the outer modern planets strictly for transits!), the traditional rulerships, the 5 conventional aspects and whole sign house. In our practice we use transits, annual profection, solar return and secondary progression.
The Seven Stars by Zakariya Al-Qazwini