Is practicing astrology against Islam?

Among Muslims, controlling the djinn or the shayatin for worldly gain is considered a form of magic, and practicing magic is clearly condemned by God in the Qur'an (i.e., [Qur'an 2:102](http://quran.com/2/102)) . As such, one could easily derive that a devout Muslim should have nothing to do with fortune-tellers who claim, by communing with (evil) spirits or accessing the "spirit world," to know the future or possess secret knowledge. There are, however, fortune-tellers who claim their knowledge comes from other sources. Astrologers, for example, base their information on observation of the stars and the celestial bodies, and not from communing with the spirit world. As such, would practicing astrology be considered acceptable in Islam, even if spirit-based forms of fortune-telling are not?