Abraham Zacuto (Hebrew: אַבְרָהָם בֵּן שְׁמוּאֵל זַכּוּת, romanized: Avraham ben Shmuel Zacut, Portuguese: Abraão ben Samuel Zacuto; 12 August 1452 – c. 1515) was a Sephardic Jewish astronomer, astrologer, mathematician, rabbi and historian. Born in Castile, he served as Royal Astronomer to King John II of Portugal before fleeing to Tunis.
His astrolabe of copper, astronomical tables, and maritime charts played an important role in the Spanish and Portuguese voyages of discovery, being used by both Vasco Da Gama and Christopher Columbus.
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