Astrologers are influenced by many astrological lineages. The oldest include Babylonian, Hellenistic, Arabic, Medieval, and the Classical astrology of the 15th & 16th Centuries. The practice of many modern astrologers can trace their roots to the Theosophical and Esoteric movement of Helena Blavatsky, Alice Baily, Bessie Besant, Rudolf Steiner and Max Heindal. This perspective mixed with the psychological perspective in the writings of Marc Emund Jones and Dane Rudhyar. In the New Age Movement of the 1960s and 1970s, you have the added influence of the humanistic perspective from astrologers such as Michael Meyer. In addition, there is a profileration of planetary bodies with the addition of the asteroids and new looks at astrology such as Uranian. In the late 1970's, many astrologers begin to emphasize the outer planets and the moon's nodes leading to the recent spiritual perspective of Evolutionary Astrologers.