The present volume offers a critical Hebrew text of the two versions of Ibn Ezra’s Sefer ha-Te'amim, the Book of Reasons, accompanied by an annotated translation and commentary. The two treatises presented here were designed by Ibn Ezra to offer “reasons”, “explanations”, or “meanings” of the raw astrological concepts formulated in the introduction to astrology that Ibn Ezra entitled Reshit Hokhmah (Beginning of Wisdom).