Gerard of Cremona (1114–1187) edited for Latin readers the Tables of Toledo (Toledan Tables), the most accurate compilation of astronomical/astrological data (ephemeris) ever seen in Europe at the time. The Tables were partly based on the work of al-Zarqali (known to the West as Arzachel), an Arab mathematician, astronomer and astrologer who flourished in Cordoba, al-Andalus, in the 11th century.
During the mid-thirteenth century, Giovanni Campano drew from these tables data for his Theorica Planetarum.
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