The Yavanajataka, or “Greek Horoscopy,” is the only ancient Sanskrit text that can be proved to derive from a Western source; hence its importance for the study of cultural transmission. David Pingree's text and translation are accompanied by notes and commentary which demonstrate that this third-century astrological poem was based on a second-century prose translation of an Alexandrian Greek original. The Yavanajataka, here published for the first time, is the most solid evidence we have of the influence of Greece upon India in antiquity; in its own right it was the fountainhead of a rich astrological tradition in India. This monumental edition has been described as “a marvel of accurate and imaginative scholarship.”