Tag Archives: Christopher Columbus

Jew of the Week: Abraham Zacuto

The Rabbi Who Saved Columbus

A page from Zacuto’s astronomical tables

Avraham ben Shmuel Zacut “Zacuto” (1452-1515) was born in Salamanca, in what is today Spain, to a religious Sephardic Jewish family. He studied both Jewish law and astronomy, becoming the rabbi of Salamanca and simultaneously an astronomy teacher. He invented a new type of astrolabe and a novel method for determining latitude at sea, which would become vital to navigators and sailors. In 1478, he published HaChibur haGadol, “The Great Book”, with detailed and easy-to-use astronomical tables. It was translated to Spanish in 1481, and Latin shortly after. This made Rabbi Zacuto world-famous and when the Jews of Spain were banished in 1492, he was immediately hired by King John II of Portugal to serve as his royal astronomer. Zacuto argued that a sea route to India was possible, and this convinced John II to finance Vasco da Gama’s famous voyage to discover the route to India, opening European sea trade with the Far East. Da Gama used Zacuto’s astrolabe and tables, and Zacuto personally trained and taught the sailors. Zacuto had also argued, based on the Zohar—the “textbook” of Jewish mysticism, dating back to Rabbi Shimon bar Yochai in the 2nd century CE—that the Earth must be spherical, and it would be possible to journey west, not east. This information was instrumental in convincing Christopher Columbus to launch his own voyage. In fact, Columbus relied heavily on Zacuto’s astrolabe and astronomical charts. In a well-known story from his third voyage, Columbus was marooned on a Caribbean island and facing both hostile natives and his own rebellious sailors. The natives refused to provide food and resources to Columbus, so he came up with a ruse. Consulting Zacuto’s tables, Columbus saw that a lunar eclipse was imminent. He told the native chief that if he will not provide resources to the sailors, the moon would go dark and God would punish them! The eclipse came and the natives panicked, giving Columbus’ men all that they needed to survive. Back in Europe, the next king of Portugal, Manuel I, followed the Spanish in expelling his Jewish subjects. Zacuto was offered to stay in Portugal if only he converted to Christianity, even just nominally. Of course, he refused, and left with his people. He first settled in Tunis, where he wrote his monumental Sefer Yuhasin, a highly-acclaimed work describing the entire history of the Jewish people. He later fulfilled his dream of making it to the Holy Land and lived his last years in Jerusalem. Rabbi Zacuto is considered one of history’s greatest and most consequential astronomers. The Zagut Crater on the moon is named after him.

Happy Lag b’Omer!

The Hidden History of Lag b’Omer

Did the Talmud Predict Today’s Crisis in Israel?

Words of the Week

The blessing in life is when you find the torture you are comfortable with. That’s marriage, it’s kids, it’s work, it’s exercise. Find the torture you’re comfortable with and you’ll do well. You’ve mastered that, you’ve mastered life.
– Jerry Seinfeld

Jew of the Week: Abraham Seneor

The Crown Rabbi Who Built Spain

A Castilian maravedi gold coin issued in 1191

Abraham Seneor (1412-1493) was born in Segovia, Castile, into a wealthy Sephardic Jewish family who served as treasurers and accountants for Spanish monarchs. Seneor himself served the Castilian crown. In 1469, he was the key negotiator that arranged the marriage of Isabella of Castile to Ferdinand of Aragon, resulting in the eventual birth of the new Kingdom of Spain. Seneor became Isabella’s main advisor and confidante. In 1480, Isabella decreed that Seneor would receive a lifetime pension of a whopping 100,000 maravedi coins per year for his invaluable services. He was also appointed the Jewish chief justice and “crown rabbi”. In this role, he worked together with his close friend and fellow rabbi-treasurer, Don Isaac Abarbanel. Between the two of them, they were able to raise the sums needed for the Spanish to defeat the Moors in the War of Grenada. They were also the ones that got crown support and funding for Christopher Columbus’ first trip to America. Seneor often intervened on behalf of the Jews, and saved countless Jewish lives by ransoming those that had been captured by pirates. In 1492, the Spanish decreed the Edict of Expulsion to exile all Jews who did not convert to Christianity. Seneor was 80 years old, and knew he wouldn’t survive exile and expulsion. While the younger Abarbanel refused to stay in Spain (although he was given an exemption), the older Seneor decided to convert, at least publicly, in order to keep his influential role and try to ease the plight of the Jews as much as possible. He helped secure temporary refugee for the Jews in Portugal, then did whatever he could to make sure the Jewish exiles did not lose all of their wealth. Still, he was unable to survive the stress of the ordeal and passed away just months after the Expulsion. Seneor had taken on the new name Fernando Coronel, starting a new lineage of Spanish nobility. The Coronel children continued to play important roles in Spanish affairs for decades to come. Many of them were arrested by the Inquisition for continuing to practice Judaism in secret; some were executed and others deported. A great number ultimately returned to Judaism in Holland and the Americas.

Words of the Week

Israel was extraordinary in being the one socially revolutionary people in the Near East to produce a literature and to survive as a distinctive cultural and religious entity.
– Norman Gottwald, renowned professor of Biblical studies and political activist