Regrettably, most of his works on astronomy were lost, but his studies on astrology survived, including a monumental 106-chapter work, "Kitab al-Mudkhal al-Kabir", a historical study composed for the Sassanian ruler Al Mansour, the second aACAyAbbasid dynasty caliph, and his study on genethlialogy
, the science of calculating positions of the heavenly bodies on nativities, in the "Kitab Tahawil Sini al-Mawalid" (Book of the Revolutions of the Years of Nativities).
One of the fields of Sasanid knowledge in which Sunbadh demonstrated a particular interest was that of astrology, and one such work survives--Kitab al-Mawalid (The Book of Nativities), a work of genethlialogy
attributed to Zoroaster which Sunbadh had translated into Arabic by a certain Said b.
These include the Diviner's Manual, astrological letters and reports, proto-horoscopes, hypsomata, "Innovations," and genethlialogy