Astronomos (Gr.). The title given to the Initiate in the Seventh Degree of the reception of the Mysteries. In days of old, Astronomy was synonymous with Astrology; and the great Astrological Initiation took place in Egypt at Thebes, where the priests perfected, if they did not wholly invent the science. Having passed through the degrees of Pastophoros, Neocoros, Melanophoros, Kistophoros, and Balahala (the degree of Chemistry of the Stars), the neophyte was taught the mystic signs of the Zodiac, in a circle dance representing the course of the planets (the dance of Krishna and the Gopis, celebrated to this day in Rajputana); after which he received a cross, the Tau (or Tat), becoming an Astronomos and a Healer. (See Isis Unveiled. Vol. II. 365). Astronomy and Chemistry were inseparable in these studies. “Hippocrates had so lively a faith in the influence of the stars on animated beings, and on their diseases, that he expressly recommends not to trust to physicians who are ignorant of astronomy.’ (Arago.) Unfortunately the key to the final door of Astrology or Astronomy is lost by the modern Astrologer; and without it, how can he ever be able to answer the pertinent remark made by the author of Mazzaroth, who writes: “people are said to be born under one sign, while in reality they are born under another, because the sun is now seen among different stars at the equinox ”? Nevertheless, even the few truths he does know brought to his science such eminent and scientific believers as Sir Isaac Newton, Bishops Jeremy and Hall, Archbishop Usher, Dryden, Flamstead, Ashmole, John Milton, Steele, and a host of noted Rosicrucians.
Source: H.P.Blavatsky - The Theosophical Glossary