astrologer

n. astrology expert, one who attempts to predict the future by the state of the stars

An astrologer practices one or more forms of astrology. Typically an astrologer draws a horoscope for the time of an event, such as a person's birth, and interprets celestial points and their placements at the time of the event to better understand someone, determine the auspiciousness of an undertaking's beginning, etc. However, the methods employed by astrologers are variable and depend on the particular astrological tradition they employ and the information desired. In the far past, the role often entailed astronomical observation or manual calculation of celestial phenomena. In more modern times, however, these methods have largely been replaced by pre-calculated ephemerides and astrological software.
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Noun
1. someone who predicts the future by the positions of the planets and sun and moon
(synonym) astrologist
(hypernym) forecaster, predictor, prognosticator, soothsayer
(hyponym) Nostradamus, Michel de Notredame

(n.)
One who studies the stars; an astronomer.
  

(n.)
One who practices astrology; one who professes to foretell events by the aspects and situation of the stars.
  

(Dan. 1:20; 2:2, 10, 27, etc.) Heb. 'ashshaph', an enchanter, one who professes to divine future events by the appearance of the stars. This science flourished among the Chaldeans. It was positively forbidden to the Jews (Deut. 4:19; 18:10; Isa. 47:13).