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How many Hebrew Israelites are there, and how worried should Jews be?
(JTA) — Dressed in matching purple hoodies and shirts, with gold fringes attached to the bottom in observance of Deuteronomy 22:12, hundreds of members of a controversial Hebrew Israelite group marched through the streets of Brooklyn on Sunday.
“Hey Jacob, it’s time to wake up,” they chanted, using a term for people of color who have yet to embrace their “true” identity as descendants of the Biblical Jacob, later called Israel. “We got good news for you: YOU are the real Jews.”
The march and a demonstration that followed at the Barclays Center were organized by Israel United in Christ in solidarity with Brooklyn Nets star Kyrie Irving, who was suspended for eight games after he posted a link to an antisemitic film on social media last month and then was slow to apologize. But IUIC has also used the controversy to promote its incendiary ideology and recruit new followers into what it calls “God’s army.”
After the demonstration — the second held by IUIC outside of the Brooklyn arena this month — the group’s founder posted a message on his Twitter account. “We are not here for violence,” Bishop Nathanyel Ben Israel wrote, “we are here for the spiritual war.”
Before 2019, those American Jews who were even aware of the once-obscure Black Hebrew Israelite spiritual movement likely associated it with the loud but non-violent street preachers who would harangue pedestrians in city centers. In December of that year, however, extremists professing Israelite beliefs attacked a kosher grocery store in Jersey City, New Jersey and a Hanukkah party in Monsey, New York. Two Jews were killed in Jersey City, and a 72-year-old rabbi who was stabbed in the head in Monsey died from his injuries three months later.
With the memory of those attacks still fresh, and against the backdrop of a surge this fall in public expressions of antisemitism combined with threats of violence against Jewish communities emanating from other extremist corners, the militant posturing of IUIC has alarmed many Jews already on edge.
Rabbi Mordechai Lightstone of Crown Heights observed on Twitter that the Israelites who regularly preach near his home on Shabbat have been “particularly aggressive” of late, heaping verbal abuse on both him and his children. On Sunday afternoon, Lightstone posted a video of IUIC members assembling for their march and rehearsing their chants in Grand Army Plaza.
“Terrifying,” commented Elisheva Rishon, a Black and Jewish fashion designer who blames Hebrew Israelites for inflaming tensions between the two communities to which she belongs. A few Twitter users compared the march to the 2017 far-right rally in Charlottesville, at which participants chanted “Jews will not replace us.”
The recent IUIC rallies give the impression that the radical wing of the Hebrew Israelite movement is large and riled up. Meanwhile, recent comments by Kanye West, the rapper who now goes by Ye, and Irving that align with elements of Hebrew Israelite doctrine suggest the movement has broad support among powerful Black celebrities.
But how big is the movement in reality? What percentage are extremists who assail Jews as impostors who stole their heritage from them? And if Black Israelism has entered the marketplace of mainstream religions in the United States, should Jews be concerned?
The numbers
The only available statistics on Israelite identification in the United States were collected as part of a small national survey conducted by an evangelical Christian research firm in 2019. For that survey, which sought to capture African-American attitudes toward the state of Israel, Lifeway Research asked 1,019 African Americans, “Which of the following best describes your opinion of Black Hebrew Israelite teachings?”
Most respondents (62%) said they are not familiar with the teachings, but 19% said they agree with “most of the core ideas taught by Black Hebrew Israelites,” and 4% said they consider themselves Hebrew Israelites. The remaining 15% said they either “firmly oppose” the teachings or disagree with most of them. (The survey did not specify what those teachings are.)
The 2020 U.S. Census put the Black population at 41.1 million, so extrapolating from the Lifeway data, there are approximately 1.6 million Hebrew Israelites in the U.S. — not counting the small numbers of Latinos and Native Americans who also belong to Israelite groups — and 7.8 million people who may not identify as Israelites but who agree with the spiritual movement’s main teachings.
For lots of these people, the attention that West and Irving have brought to their belief system has been validating.
“Israelism is becoming part of the plausibility structure of Black America,” Christian activist and author Vocab Malone told the Jewish Telegraphic Agency, referring to a social context in which certain ideas are considered credible. “The suspicions that a lot of folks have toward the Jewish community, they think they’re vindicated now.”
Scott McConnell, Lifeway’s executive director, told JTA that the survey’s sponsor, the Christian Zionist organization Philos Project, supplied the question about Hebrew Israelite teachings. Asked if there are plans to include similar questions in future surveys, he replied, “I know there are some pastors at African-American churches that have concerns about some of their parishioners being led astray by the teachings of the Hebrew Israelites, so we’ll keep it on our radar.”
Malone, who uses an alias in keeping with hip-hop culture, is a close observer of the Israelite world. The Phoenix resident frequently engages in debates on the street and online with members of groups described as hateful by the Southern Poverty Law Center — including IUIC, Israelite School of Universal Practical Knowledge, Israelite Church of God in Jesus Christ, and The Sicarii — in hopes of convincing them to follow what he considers to be the true path of Christianity.
Founded in 2003, IUIC has proven the most adept at creating public spectacles and garnering media coverage. The group operates 71 U.S. chapters and 20 international ones, according to the Anti-Defamation League, and it holds men’s conferences each year that culminate in choreographed marches on city streets, like the one on Sunday in Brooklyn. Based on the size of those marches, Malone estimated that national membership has grown from around 5,000 in 2015 to around 10,000 today. Other radical groups likely have much smaller memberships but don’t share any figures, preferring to “play their cards close to their chest,” Malone said.
These estimates suggest that the extremists comprise a very small percentage of the 1.6 Hebrew Israelites living in the United States.
Ultimately, IUIC has a goal of recruiting 144,000 Black, Latino and Native American people who will be spared by God during the end time, as foretold in the book of Revelation. In order to achieve this goal, the group sends representatives to proselytize overseas, including in parts of Africa and the Caribbean. (IUIC did not respond to requests for comment from JTA.)
Both the Southern Poverty Law Center and the ADL monitor the activities of IUIC and other radical camps, as Israelites call their groups. However, spokespeople for both organizations told JTA they do not know how many people belong to these camps.
An online movement
What is clear is that the camps have greatly expanded their reach in recent years, taking their message from street corners to the entire globe thanks to the internet and social media. IUIC members run dozens of YouTube, Facebook, Instagram and Twitter accounts where they post a constant stream of videos and memes, many containing antisemitic tropes. One recent Instagram post shows a startled-looking Hasidic Jewish man holding his hat above the words “The Synagogue of Satan.” (Louis Farrakhan, the leader of the Nation of Islam, uses similar language about Jews. A video he recorded this month defending West and Irving has been viewed millions of times.)
The main IUIC YouTube channel, @IUICintheClassRoom, has 126,000 subscribers and 29.4 million video views. A series of videos posted three years ago on the channels of local chapters provide some insight into how members hear about IUIC and why they join.
The most common way these members say they found their way to the camp was via videos they watched online. “Prior to actually coming to IUIC, I did do some Israelite window shopping,” recounts Officer Joshua of IUIC Tallahassee. “I always questioned myself, why is it that our people are at the bottom? How come we get the worst jobs and so forth? I knew Christianity wasn’t answering my questions, so what I did was I just started soul searching.”
As part of his quest, Joshua says he stumbled upon a video of Bishop Nathanyel and other IUIC leaders preaching on the street. “I was like man, these brothers really know what they’re doing, they really have our history,” he says. “That’s what actually made me do more research on IUIC and the truth.”
Sar (“Minister”) Ahmadiel Ben Yehuda speaks at the African Hebrew Israelites’ annual New World Passover celebration in Dimona, Israel, May 2013. (Andrew Esensten)
In another video, Sister Ezriella from the Concord, North Carolina, branch explains that as a young adult, she felt uncertain about her life’s purpose. Then her mother shared information with her about IUIC. “She was so happy it changed her life, I had to take notice and I had to come check it out for myself,” she says. “I fell in love with it. I fell in love with finding out who I am.”
A number of Black, male celebrities have also been drawn into the wider Israelite orbit in recent years, including rappers Kendrick Lamar and Kodak Black, TV host Nick Cannon, boxer Floyd Mayweather and retired NBA player Amar’e Stoudemire.
Some of these celebrities appear to have been exposed to Israelite teachings by relatives and other acquaintances. Lamar, who famously rapped “I’m a Israelite, don’t call me Black no mo’” on a 2017 song, learned about Israelism from a cousin who was involved with IUIC. Black began identifying as a Levite in 2017 after studying scripture with an Israelite priest while serving a jail sentence in Florida. Stoudemire has said his mother taught him he had “Hebraic roots.” (He officially converted to Judaism in 2020, a step most Israelites reject because it contradicts their claims of already being authentic Jews.)
Isabelle Williams, an analyst at ADL’s Center on Extremism who tracks radical Israelite camps, said celebrity endorsements of the ideology can have a big impact because they come from figures who are widely respected.
“If people came upon an extremist Black Hebrew Israelite group street preaching, it might be easier to dismiss it and recognize the extreme ideology behind it,” she said. “But when it’s being shared by these influential figures, people might be less likely to recognize the really insidious ideology and dangerous antisemitic conspiracy theories that are behind these statements.”
Williams added that a range of extremist groups have seized on comments made by West and Irving. “It’s not just BHI and NOI groups that are leveraging this moment,” Williams said. “We’ve seen white supremacists who are also using this recent attention and circulation of antisemitic conspiracy theories to promote their own agenda.”
Rabbi Capers Funnye is the most prominent Israelite leader in the U.S. He serves as chief rabbi of the International Israelite Board of Rabbis, an organization that provides spiritual guidance to about 2,500 people in the United States, along with tens of thousands of Israelites in southern and west Africa.
In an interview, Funnye condemned West, Irving and the radical Israelite camps that have rallied around them. “God is never about divisiveness,” Funnye said. “God is never about hatred. God is never about, ‘You ain’t.’ I don’t have to say what you aren’t to make me who I am.”
A member of the Chicago Board of Rabbis and the leader of a Chicago synagogue with a mixed membership of around 200 Jews and Israelites, Funnye was at pains to differentiate his community from IUIC and its ilk: His follows the Torah and supports the state of Israel, he said, while others follow both the Old and New Testaments, worship Jesus and reject Israel’s government as illegitimate.
“Whatever army that Kyrie is speaking about, we are not a part of his army,” he said, referring to a comment Irving made during an Oct. 29 press conference about how he has “a whole army” behind him.
But Funnye said another of Irving’s recent statements — “I cannot be antisemitic if I know where I come from” — resonated with him and his congregants.
“We are Semitic,” he said of Black people who identify as Israelites, “so now we really have to draw a line when antisemitism is only defined by one’s complexion or ethnicity. We were not the ones that racialized Judaism, and we will never racialize it because Jews are not a race.” (“Semitic” refers to people who speak Semitic languages, such as Hebrew and Arabic.)
Outside of the United States, the largest organized group of Hebrew Israelites is located in Israel. The African Hebrew Israelites of Jerusalem are a Dimona-based community of more than 3,000 African-American expatriates and their Israeli-born offspring.
African Hebrew Israelite youth serve in the army — not Kyrie Irving’s or IUIC’s army, but the Israel Defense Forces. After 53 years in Israel, the community has never been fully accepted, in part because they are not Jewish according to halacha, or Jewish law. Currently, some 100 community members are being threatened with deportation for living in the country illegally.
Ahmadiel Ben Yehuda, the African Hebrew Israelites’ minister of information, said he interpreted Irving’s remarks as a reference to “the global awakening of people of African ancestry to their Hebraic roots.” He said the backlash Irving has faced shows that the conversation around this awakening must involve qualified representatives of communities who can cite reputable sources — not documentaries such as the one Irving boosted — “Hebrews to Negroes: Wake Up Black America” — in support of their claims of Israelite ancestry.
“What is certain is that Israel and Judaism must figure out a way to better accommodate these communities,” Ben Yehuda said. “This is not going to fade away, and it shouldn’t. It will intensify as the awakening continues.”
How this awakening will affect Jews and established Jewish communities remains to be seen.
In September, George Washington University’s Program on Extremism released a report titled “Contemporary Violent Extremism and the Black Hebrew Israelite Movement.” The report noted that the “predominant threat” today comes not from Israelite groups themselves but from “individuals loosely affiliated with or inspired by the movement.”
Malone, the Christian activist, cautioned that as the extremist wing of the Israelite movement grows, more violent lone wolves may emerge.
“There’s a big funnel with any movement, and the bigger the funnel is, you get certain things down at the bottom,” he said. “This is not Buddhism. This is a different kind of thing with a different kind of rhetoric.”
—
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Poll: Most New York City Jewish voters say criticism of Israel is often a cover for antisemitism
A majority of Jewish voters in New York City believe criticism of the Israeli government is often used as a cover for antisemitism, and more are concerned about antisemitic speech and attitudes than physical hate crimes, according to a new poll examining Jewish views on rising antisemitism and the city’s political climate. The survey also found that Jewish voters were more likely to blame the political left than the right for scapegoating Jews.
The Honan Strategy Group survey of 503 Jewish voters across the five boroughs, shared exclusively with the Forward, was conducted Oct. 2 through Oct. 6 via text-to-web before Mayor Zohran Mamdani’s controversial Oct. 7 statement and before his supporters turned on him during a peace vigil last Wednesday.
The survey found that while 85% do not consider criticism of the Israeli government or its leaders inherently antisemitic, 56% believe such criticism is often used as a cover for antisemitism. Meanwhile, seven in 10 Jewish voters believe they are being blamed for society’s problems, and more hold the political left responsible than the right.
The poll has a reported margin of error of plus or minus 4.3 percentage points.
The findings highlight the ongoing tensions between Mamdani and parts of the Jewish community over his harsh criticism of Israel, his defense of pro-Palestinian protesters’ rights and his ties to the Democratic Socialists of America and other left-wing groups.
Throughout his mayoral campaign and since taking office, Mamdani has sought to draw a line between his opposition to Israel and Zionism and his commitment to protecting Jewish New Yorkers. Last month, he rolled out a new municipal strategy to combat antisemitism, but the plan did not adopt a definition of the term.
Last Wednesday, on the third anniversary of the Oct. 7 Hamas attack on Israel, Mamdani issued a statement condemning Israel’s war in Gaza as a “genocide” and accusing the U.S. government of complicity in Israeli war crimes, irking Jewish leaders, including some allies.
The poll also found Jewish voters divided over whether some positions Mamdani has taken toward Israel are antisemitic. By 48% to 42%, respondents said describing Israel’s actions in Gaza as genocide is not antisemitic. Similarly, 49% said boycotting Israeli products and companies is not antisemitic, compared with 43% who said it is. But a majority — 52% — said denying Israel’s right to exist as a Jewish state is antisemitic. Almost two-thirds consider protesting outside synagogues an act of antisemitism.
Mamdani, who rose to power aligned with pro-Palestinian activism and is the city’s first Muslim mayor, has repeatedly accused Israel of committing genocide in Gaza, has refused to recognize Israel specifically as a Jewish state and has called for a permanent end to city investments in Israel Bonds.
Mamdani has also defended the rights of anti-Israel protesters, including outside synagogues hosting events promoting real estate in Israel and the West Bank. Some demonstrations have included chants calling for an “intifada” and other rhetoric Jewish leaders described as antisemitic and intimidating, slogans Mamdani has either condemned or encouraged people not to use.
“The data shows broad consensus that criticism of Israel’s government is not antisemitic on its own,” pollster Bradley Honan told the Forward. “But it also shows that most Jewish voters have watched that criticism turn into something more troubling, and they want that line taken seriously.”
Earlier this year, the city’s top Jewish officials urged Mamdani to recognize Israel’s centrality to Jewish identity, and a group of liberal rabbis who met with the mayor warned Mamdani that his rhetoric on Israel is “causing harm.”
The same survey found widespread disapproval among Jewish voters of Mamdani’s handling of antisemitism.
Respondents also appeared to disagree with Mamdani’s approach to combating antisemitism. His plan includes millions of dollars for security, hate-crime prevention and Jewish education. It does not adopt a formal definition of antisemitism and offers little clarity on how the administration views anti-Zionism.
In the poll, 34% said antisemitic speech and attitudes were a bigger problem than physical hate crimes, such as assaults and vandalism. Just 8% said hate crimes were the bigger concern, while 46% considered both equally serious.
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The photos may be black and white, but the klezmer world is drenched with color
In Lloyd Wolf’s evocative photography exhibit, “A Joyful Noise,” you can almost hear the Klezmer music — plaintive and celebratory, earthy and devout, and always with a profound, but not easily definable, outpouring of Yiddishkeit.
Now showing at the Dr. Bernard Heller Museum at New York’s Hebrew Union College, the 45 images feature solo, dual and group portraits of Klezmer musicians performing from the mid 90’s through 2024.
They may be at a wedding, in concert, or practicing alone in a bucolic setting. In one humorous picture, six Klezmer musicians emerge from a row of porta-potties, instruments in hand. Most of the pictures, arranged chronologically, are in black and white.
“The trick in photographing music, which is invisible, is that it has to be translated into a visible form,” said the Dayton, Ohio-born Wolf during a phone conversation from his home in Arlington, Virginia. “You have to pick up on the energy. It’s like jamming, only it’s silent. I’m often up on the stage with the musicians, right up in their faces. Because they know me they’re not posing. I can photograph bad musicians but the picture is much better if the musicians are great. It just raises the level of what you do.”

Wolf, who grew up hearing classical music, show tunes, folk, and Gilbert & Sullivan, has always loved music and musicians and he has photographed many, including Brian Wilson, Wynton Marsalis and The Grateful Dead.
The genesis of the exhibit was Wolf’s stunning book, A Joyful Noise! Klezmer in Motion.
“I’ve worked with Lloyd on several prior exhibits, mostly issue-oriented ones, and knew his work to be very good as well as interesting,” said Nancy Mantel, the exhibit’s curator. “Anything happy at this time seems like a win. And it’s about music and memories — also good.”
“It was the perfect moment to present our exhibition to celebrate nearly four decades of a vital musical genre that has immeasurably enriched Jewish life,” added Jeanie Rosensaft, the museum’s director. “Klezmer has contributed greatly to the growing appreciation for Yiddish language and culture among younger generations.”
A way to engage with the world
Klezmer music emerged from the world of Ashkenazi Jews in pre-Holocaust Eastern and Central Europe. It has roots in both Hasidic rituals and the Jewish (and Romanian, Hungarian and Romani) folk music of the time. In the post- World War II years, Klezmer music largely disappeared, in part because it was a painful reminder of what had been lost. In the 80s and 90s, when ethnicity became cool, it enjoyed a renaissance that continues today.
According to Wolf, there are any number of reasons why young people are attracted to Klezmer, including the fact that it provides a way to celebrate and identify that feels authentic and fun.

“Most of their roots are in the Yiddish world of their immigrant ancestors from Eastern Europe,” he said. “Some of it perhaps has to do with political and cultural gaps that have grown between Diaspora Jews and what they see and feel going on regarding the policies and actions of the current Israeli government.”
Wolf’s favorite picture, and coincidentally mine as well, presents Klezmer musician Michael Winograd sporting a jaunty little hat and playing his clarinet on an otherwise empty Coney Island boardwalk against a backdrop of immobilized rides, the iconic roller coaster and parachute drop. All by itself, the setting brings to mind an old ethnic, Jewish New York fixed in time.
“There is an inherent energy in Coney Island and the architecture is coherent,” said Wolf. “It’s just fun to look at. As Duke Ellington said, ‘It don’t mean a thing if it ain’t got a swing.’ I took that picture because Mike said he needed a cover shot. It was a freezing day, but he took his coat off. I said, ‘start playing.’ It was winter and there were no people out. That made for a much better picture than if we had done it in the summer with all the people.”
When I asked him when he chooses to shoot in black and white as opposed to color, he explained that, while there is usually no set plan ahead of time, he generally prefers black and white, “for its simplicity. It takes it out of a specific time. It’s more abstract, more classic. If I want a picture to be of a specific time and place, I’ll shoot in color.”

Wolf calls himself a documentary photographer and says his aesthetic influences include Gordon Parks, Dorothea Lange and Weegee, whose work combines “meaningful artistry and committed documentary.”
Wolf is very much the social activist. His books depict such topics as the Vietnam Memorial, social diversity in Columbia Pike, and Jewish fathers and mothers.
He says his interest in Klezmer musicians and music was at once improbable and inevitable. But no one was more surprised than his mother, a Bronx-born daughter of Yiddish-speaking Eastern European immigrants who desired nothing more than to be a fully assimilated American woman devoid of any accent or rituals.
“She was shamed by her Christian neighbors into sending me to Hebrew School and I did have a Bar Mitzvah,” recalled Wolf. “But we were not observant.”
His father, a refugee from Nazi Germany was a proud German Jew, highly cultured, intellectual and accomplished. “A computer pioneer, he was the technical director for building the ARPANET, the system that evolved into the Internet,” Wolf said.

The Holocaust, indeed Jewish topics in general, were not discussed in Wolf’s home. A child of the 60s, Wolf came of age during anti-war protests, love-ins and Jimi Hendrix. He majored in political science at Goddard College, though he never had any real interest in pursuing that field as a carer, he said. “For me photography was the way to engage with the world.”
He earned his Masters in photography at Trinity College in Hartford where he started freelancing for local newspapers. One of his outlets was the B’nai B’rith Magazine, which marked a turning point in his life and career. An early assignment took him to Treblinka, Poland and Israel, where he met his father’s cousins who, like his father, were forced to flee their homes. But unlike his father they talked about the Holocaust.
“I learned from them, for the first time, what had happened,” he said. “When I came back home from Israel I started going to shul.”
A music beyond politics?
Wolf was first turned on to Klezmer music in 1992 when he was assigned to cover two of the new Klezmer revival groups: Kapelye and the Klezmatics.
“I met up with Kapelye at a rehearsal space in the Workman’s Circle building,” he wrote to me in an email. “I can’t recall any particular melody at this date but do remember being in awe of Adrienne Cooper’s deep, commanding, matronly voice and presence. The next night I was to meet a guy from the Klezmatics at the Bottom Line club, Frank London. Here was a Jew roughly of my generation, who fully expressed his passion and art in an explicitly ethnic context, and with great skill and brio. He and the other band members at the time delivered a masterfully exhilarating concert: Transcendent, beautiful, sweeping, a grand opening of the soul in sound.”

London played a central role at the exhibit’s festive opening night reception by leading a Klezmer concert, which was, London said, fueled by Wolf’s photography, but also by the other exhibit in the gallery — paintings that explored “Mothers, Prophets, Warriors: Women of the Bible.”
“Both Jewish, both joyous and we were part of the joyous noise,” London said. “Our music is celebratory. The musicians share a common language and repertory. Nobody had sheet music.”
Throughout the performance, which featured two clarinetists (including Winograd), Wolf was moving about and shooting away.
The audience seemed to be having a fine time. For much of the performance they silently emanated a collective satisfaction; midway through, an elderly woman moved to the back where, all by herself, she started dancing to the music.
Then, something else happened. A few women were up and dancing into the aisles. They held hands and moved around the chapel, swaying this way and that. Slowly others in the audience joined in — men and women, young and old, most able-bodied, some less so. Round and round they went.

“When people define Klezmer, they often talk about it as dance music,” said London. “Names of different tunes are often names of dances. Whenever we play this music in its unadulterated form it’s always to celebrate Yiddish Ashkenazi culture that is also universal. It is beyond politics.”
I don’t agree. For me, the wordless dancers exuded an unabashed, unapologetic and perhaps even defiant ethnic identification, joy and pride. It was a deeply moving and searing political statement.
After the concert, I went back to look at Wolf’s photographs. They worked wonderfully well all by themselves. Still, the music and dancing I had just witnessed shed a new, more complex light on the pictures. Either way, the images on the wall and those that I took from the recital lingered as I left the building and walked up Mercer Street back to the 8th Street subway station.
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On Columbus Day, remember Abraham Zacuto, the Jewish astronomer history forgot
(JTA) — Every October, Christopher Columbus returns not only as history but as controversy. The voyages associated with his name transformed the world, but their legacy is inseparable from conquest, coercion and the destruction that followed European expansion.
Yet the same Iberian age also produced a quieter and far less controversial revolution: advances in astronomy, mathematics, cartography, instruments and practical navigation that made sustained oceanic voyaging possible. Its protagonists included scholars, translators, mapmakers, instrument makers and pilots whose names are far less familiar than those of the captains who commanded the ships.
Among them, one figure deserves particular remembrance on Columbus Day: Abraham Zacuto, a Jewish astronomer born in Salamanca around 1452. Zacuto belonged to the same Iberian world as Columbus, but experienced its monarchies very differently. In 1492, Columbus sailed west under the patronage of Ferdinand and Isabella. That same year, the Catholic monarchs ordered the Jews of their realms to convert or leave. Zacuto left Castile and continued his work in Portugal. The celebrated maritime discoveries and the expulsion of Iberian Jewry were therefore not distinct historical worlds; they unfolded under the same rulers, at the same moment, within the same culture of ambition, knowledge and power.
Zacuto stands out within that larger scientific story. He was a rabbi, astronomer, mathematician and historian whose astronomical work helped give oceanic navigation a new degree of precision and practicality. His contribution belongs not at the margins of the Age of Exploration but within the scientific infrastructure that made long-distance navigation increasingly systematic.
Around 1478, Zacuto completed his great Hebrew astronomical work, “Ha-Hibbur ha-Gadol,” the “Great Composition.” Working within a long scientific conversation that included Greek, Islamic, Jewish and Christian astronomy, he refined and organized astronomical calculations in forms of exceptional practical value.
After the expulsion from Spain, Zacuto entered Portugal at precisely the moment when the kingdom was pushing maritime exploration farther into the Atlantic and down the African coast. Zacuto’s pupil, José Vizinho, a Jewish adviser to Portuguese King John II, was associated with the practical Latin and Castilian presentation of Zacuto’s astronomical material. In 1496, Zacuto’s Almanach Perpetuum was printed at Leiria in four known issues – three with Latin preliminary matter and one with Castilian.
The importance of those tables was intensely practical. They supplied precise, ready-to-use values for the changing position of the sun through the year. For a pilot on the high seas in daylight, far from recognizable coastlines, this meant that a noon observation of the sun could be combined with solar-declination data to determine latitude — the ship’s north-south position. The difficult astronomical calculations had already been embodied in the tables. What remained aboard ship was an operational procedure: Observe the sun, consult the appropriate value and calculate latitude. That combination of precision and usability greatly facilitated daytime position-finding at sea. Solar tables derived from Zacuto’s work entered early Portuguese navigational manuals and became part of the practical scientific culture of oceanic travel.
The clearest measure of Zacuto’s importance may be what happened next. The Almanach did not remain a local Portuguese publication. Its tables were reprinted repeatedly in Venice in 1498, 1502, 1525 and 1528. A work first printed in Leiria moved into one of Europe’s great publishing centers and continued to circulate for decades. That publishing history alone tells us something about the standing Zacuto’s astronomy acquired.
Its reach extended farther still. Zacuto’s astronomical material was translated and adapted into Arabic. One Arabic version was produced, likely in Istanbul, in 1505-06; another, associated with Ahmad ibn Qasim al-Hajari in Morocco around 1624, survives in several manuscripts. The work of a Jewish astronomer writing in Hebrew in 15th-century Salamanca had crossed into Latin, Castilian and Arabic scientific cultures.
Zacuto’s name also became entwined with the memory of the great navigators. Accounts have long connected his tables with Columbus and Vasco da Gama, including the famous 1504 lunar eclipse in Jamaica. In this episode, Columbus intimidated Indigenous Jamaicans by predicting the disappearance of the moon, relying on Zacuto’s almanac, which he had on board. A manuscript connected with the Almanach also survives in Seville’s Biblioteca Colombina, the library created by Columbus’s son Hernando. Taken together, these associations reveal the stature Zacuto’s work acquired in the historical memory of the Age of Exploration.
Perhaps the most striking part of Zacuto’s story is what happened to the man himself. Portugal valued the kind of expertise he represented. Yet in December 1496, King Manuel I ordered Portugal’s Jews to leave unless they converted, and in 1497 the crown subjected the Jewish population to mass forced conversion. Zacuto left Portugal as well.
Exile did not end either his travels or his scholarship. From Portugal he moved through North Africa, including Tunis, before eventually reaching Jerusalem. There, late in life, he returned once more to the astronomical work that had made his name known across the Mediterranean, recalculating and updating his earlier tables for the Jewish calendar and the meridian of Jerusalem. The strongest recent reconstruction of his life places his death in Jerusalem in Tevet 5274, or late 1513 or very early 1514 — commonly given as 1514.
Zacuto’s story is therefore larger than a footnote to Columbus. It joins two strands of Sephardic history too often told apart: persecution and exile, and the transmission of knowledge, texts and technologies across borders.
Zacuto’s own tables and 15th-century procedures are now obsolete, but their underlying navigational logic endures. Modern celestial navigation still determines position by combining observations of the sun, moon, planets or stars with authoritative astronomical data. The U.S. Naval Academy requires all midshipmen to study navigation, and its current curriculum includes celestial navigation alongside electronic methods. The U.S. Naval Observatory still describes celestial navigation as a critical independent backup to GPS and other electronic systems. And the Nautical Almanac, first published in 1855, remains the standard U.S. Navy resource for marine celestial navigation. The instruments and calculations have changed, but the essential logic remains: Observe the heavens, consult reliable astronomical data and determine position.
Zacuto’s scientific reputation also survives in an unexpected place. In 1935, the International Astronomical Union formally adopted the name Zagut for a lunar crater honoring Abraham ben Shmuel Zacuto. Modern astronomy has, quite literally, written his name onto the Moon.
Columbus remains a household name because voyages leave dramatic images: ships, landfalls, encounters and conquest. The calculations, tables, instruments, translations and printed books that made such voyages possible are easier to forget. Remembering Zacuto widens the story: His tables brought greater precision and practicality to daytime navigation; his work crossed languages and continents; and his life traced the routes of Sephardic exile from Iberia to Jerusalem. The age of maritime discovery was also an age of scientific discovery, and some of the knowledge that carried Iberian ships across oceans was created by scholars whose communities those same monarchies expelled.
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The post On Columbus Day, remember Abraham Zacuto, the Jewish astronomer history forgot appeared first on The Forward.

