The first Cassini to explore Saturn was a person

TWO CASSINIS The Cassini spacecraft has become famous for its stunning views of Saturn, including this image of the unlit side of the rings taken in 2012. But what do we know about the man Cassini was named for?

As the Cassini spacecraft plunges toward its death on Saturn, the world’s knowledge of the famous ringed planet continues to accumulate. Thanks to years of observations by the versatile probe, astronomers now know Saturn as intimately as macaroni knows cheese. But still hardly anyone outside the world of astronomy knows anything about Cassini — and I don’t mean the spacecraft, but the guy it was named for.

Gian Domenico Cassini was an Italian astronomer, born in Perinaldo in 1625, around the time that Galileo was battling the church over Copernicus’ revelation that the Earth orbits the sun. Cassini was attracted to poetry but was also good at math. He got his start in science via astrology, which back then was not considered quite as completely idiotic as it is today. In fact, astronomy itself was often supported by wealthy people in order to get better astrological forecasts. One such wealthy Italian, an amateur astronomer, was impressed with a pamphlet on astrology that Cassini had written; it earned him an invitation to work at the amateur’s observatory, near Bologna.

From the leading scientists at Bologna, Cassini learned the importance of using high-quality instruments to make the most precise measurements possible. His talents were soon recognized; by 1650 Cassini’s accomplishments and reputation earned him the chair in astronomy at the university in Bologna. He continued his research during the 1650s, taking a particular interest in comets.

Gian Domenico Cassini was an Italian astronomer who studied comets, the sun and solar eclipses. After mastering the moons of Jupiter, he turned to Saturn.

Cassini was an old-school conservative kind of scientist, not even inclined to take Galileo’s side on the Earth-orbiting-the-sun issue. Cassini preferred Tycho Brahe’s position that the other planets orbited the sun, but the sun then orbited the Earth. (Later Cassini accepted the Copernican sun-centered solar system, but only half-heartedly.) Cassini also was no fan of Newton’s law of gravity.

Cassini’s work as an eminent Italian scientist was not limited to astronomy. Called on to referee a…

Stitching a Supernova: A Needlepoint Celebration of Science by Cecilia Payne, the First Person to Earn a Ph.D. in Astronomy

Stitching a Supernova: A Needlepoint Celebration of Science by Cecilia Payne, the First Person to Earn a Ph.D. in Astronomy

“The eye that directs a needle in the delicate meshes of embroidery will equally well bisect a star with the spider web of the micrometer,” astronomer Maria Mitchell, who paved the way for women in science, wrote in a beautiful 1878 diary meditation on the needle as an instrument of the mind. “I am an instrument in the shape of a woman,” the poet Adrienne Rich channeled Caroline Herschel a century later in her sublime ode to the world’s first professional woman astronomer, who spent her mornings in needlework.

But nowhere is this strangely fertile intersection of needlepoint and astronomy more striking than in a forgotten labor of love by the English-American astronomer and astrophysicist Cecilia Payne-Gaposchkin (May 10, 1900–December 7, 1979) — the first person to earn a Ph.D. in astronomy and the first woman to chair a department at Harvard.

Cecilia Payne, Harvard College Observatory

In her autobiography, Cecilia Payne-Gaposchkin: An Autobiography and Other Recollections (public library), Payne recounts that she first fell in love with astronomy as a small child, when she saw a meteorite blaze across the sky. Her mother, wheeling young Cecilia in the pram, explained what the celestial sighting was and made up a rhyme to help the little girl remember it:

As we were walking home that night
We saw a shining meteorite.

The seed planted that night blossomed when Payne won a scholarship to Cambridge at the age of nineteen, plunging herself into the sciences. After attending a lecture by the great astronomer and mathematician Sir Arthur Eddington on his solar eclipse expedition confirming Einstein’s theory of relativity, she experienced “a complete transformation of [her] world picture,” as she recounted in her autobiography, and resolved to become an astronomer.

But although Payne completed her studies at Cambridge, she was not awarded a degree — the university wouldn’t accredit women until 1948, nearly half a century after Austrian universities began admitting women. Disheartened by her prospects in England, Payne applied for a fellowship at the Harvard College Observatory — home to the Harvard Computers, the trailblazing women who made major astronomical discoveries decades before they could vote — and went on to earn a Ph.D. in astronomy from Radcliffe College, now part of Harvard.

In her 1925 doctoral thesis, Payne theorized that stars were made primarily of hydrogen, which rendered it by far the most abundant element in the universe — a landmark discovery illuminating the chemical composition of the cosmos. But when her dissertation was reviewed, a male astronomer persuaded her not to publish her conclusion because it challenged the era’s accepted theories. When that same astronomer changed his mind and came to the same conclusion himself four years later, he published it in a paper barely giving Payne credit for the discovery — a misattribution that persists to this day and is, of course, far from singular in the history of science: The same fate befell Beatrix Potter’s revolutionary theory of lichen reproduction, mathematician Sophie Germain’s work on elasticity,…

The Universe in Verse: Astrophysicist Janna Levin Reads “Planetarium,” Adrienne Rich’s Tribute to Women in Astronomy

The Universe in Verse: Astrophysicist Janna Levin Reads “Planetarium,” Adrienne Rich’s Tribute to Women in Astronomy

Caroline Herschel, the first professional woman astronomer, was a remarkable woman who lived a long and pathbreaking life. Her parents deemed her too ugly to marry and envisioned for her a life as a servant — she became the Cinderella of the household, tending to the domestic needs of her parents and her eleven siblings. But Herschel, though incredibly humble, had a tenacity of spirit that kept her quiet passion for the life of the mind burning. She went on to pave the way for women in science, becoming the first woman admitted into the Royal Astronomical Society — the era’s most prestigious scientific institution — alongside the Scottish mathematician Mary Sommerville (for whom the word “scientist” was coined).

Exactly 120 years after Herschel’s death, the great poet and feminist Adrienne Rich (May 16, 1929–March 27, 2012) — a woman who espoused the political power of poetry and believed that “poetry can break open locked chambers of possibility” — commemorated Herschel’s far-reaching legacy of unlocking a universe of possibility for women in a beautiful 1968 poem titled “Planetarium,” found in Rich’s indispensable Collected Poems: 1950–2012 (public library).

At The Universe in Verse — my celebration of science through poetry, which also gave us Neil Gaiman’s new feminist poem about the dawn of science — astrophysicist and author Janna Levin brought Rich’s masterpiece to life in an enchanting reading:


Thinking of Caroline Herschel (1750–1848)
astronomer, sister of William; and others.

A woman in the shape of a monster
a monster in the shape of a woman
the skies are full of them

a woman ‘in the snow
among the Clocks and instruments
or measuring the ground with poles’

in her 98 years to discover
8 comets

she whom…

The Measure of All Things: How Two French Astronomers Nearly Lost Their Lives Revolutionizing the World with the Invention of the Meter

“The fundamental fallacy of utopianism is to assume that everyone wants to live in the same utopia.”

The Measure of All Things: How Two French Astronomers Nearly Lost Their Lives Revolutionizing the World with the Invention of the Meter

In her memoir, the trailblazing astronomer Caroline Herschel recounted frequently having to “measure the ground with poles” when she first began making astronomical observations in the 1780s. It seems odd that something as grand and lofty as studying the heavens would necessitate something this humble and earthbound, but this seemingly mundane task is important for two reasons — it reminds us that astronomers were the original measurers of everything we know, but it also raises the question of what the ground was measured in. For it wasn’t until a generation later that the measures of the world were standardized, thanks to the French astronomers Pierre Méchain and Jean Baptiste Joseph Delambre, who set out to unite humanity by creating a single measure: the meter, arguably the most impactful mathematical concept since the invention of zero, central to everything from the speed of light and our basic understanding of the universe to the daily practicalities of shoe sizes, doorframe dimensions, and driving speed limits. Over and over during their seven-year quest for peace through mathematical perfection, they stumbled and fell and got back up, nearly losing their heads to the guillotine on multiple occasions as they toiled to create an equalizing measurement that would “encompass nothing that was arbitrary, nor to the particular advantage of any people on the planet.”

Jean Baptiste Joseph Delambre and Pierre Méchain

Historian Ken Alder tells the story of Delambre and Méchain’s ambitious, improbable, and heroic feat in The Measure of All Things: The Seven-Year Odyssey and Hidden Error That Transformed the World (public library). He casts the stakes:

In June 1792 — in the dying days of the French monarchy, as the world began to revolve around a new promise of Revolutionary equality — two astronomers set out in opposite directions on an extraordinary quest. The erudite and cosmopolitan Jean-Baptiste-Joseph Delambre made his way north from Paris, while the cautious and scrupulous Pierre-François-André Méchain made his way south. Each man left the capital in a customized carriage stocked with the most advanced scientific instruments of the day and accompanied by a skilled assistant. Their mission was to measure the world, or at least that piece of the meridian arc which ran from Dunkerque through Paris to Barcelona. Their hope was that all the world’s peoples would henceforth use the globe as their common standard of measure. Their task was to establish this new measure — “the meter” — as one ten-millionth…

15 Female Mathematicians Whose Accomplishments Add Up

In many periods of history, women have been discouraged from applying their minds to mathematics—but a few persevered. The world-altering contributions of these 15 notable female mathematicians include making hospitals safer, laying the groundwork for the computer, and advancing space flight.

Hypatia (c.355–415) was the first woman known to have taught mathematics. Her father Theon was a famous mathematician in Alexandria who wrote commentaries on Euclid’s Elements and works by Ptolemy. Theon taught his daughter math and astronomy, then sent her to Athens to study the teachings of Plato and Aristotle. Father and daughter collaborated on several commentaries, but Hypatia also wrote commentaries of her own and lectured on math, astronomy, and philosophy. Sadly, she died at the hands of a mob of Christian zealots.

Maurice Quentin de La Tour via Wikipedia // Public Domain

Emilie Du Chatelet (1706–1749) was born in Paris in a home that entertained several scientists and mathematicians. Although her mother thought her interest in math was unladylike, her father was supportive. Chatalet initially employed her math skills to gamble, which financed the purchase of math books and lab equipment.

In 1725 she married an army officer, the Marquis Florent-Claude du Chatalet, and the couple eventually had three children. Her husband traveled frequently, an arrangement that provided ample time for her to study mathematics and write scientific articles (it also apparently gave her time to have an affair with Voltaire). From 1745 until her death, Chatalet worked on a translation of Isaac Newton’s Principia. She added her own commentaries, including valuable clarification of the principles in the original work.

Sophie Germain (1776–1831) was only 13 when she developed an interest in mathematics, one that could be blamed on the French Revolution. Since the fighting raged around her home, Germain could not explore the streets of Paris—instead she explored her father’s library, teaching herself Latin and Greek and reading respected mathematical works. Germain’s family also tried to discourage her academic leanings. Not wanting her to study at night, they denied her a fire in her room, but she lit candles and read anyway, bundled in blankets.

Since women’s educational opportunities were limited, Germain studied secretly at the Ecole Polytechnique, using the name of a previously enrolled male student. That worked until the teachers noticed the dramatic improvement in the student’s math skills.

Although Germain never worked as a mathematician, she studied independently and wrote about the subject. She is best known for her work on Fermat’s Last Theorem, considered at the time to be one of the most challenging mathematical puzzles. A 17th century mathematician named Pierre de Fermat claimed he could prove that the equation x^n + y^n = z^n had no integer solution when n was greater than 2, but his proof was never written down. Germain proposed a new way of looking at the problem.

Germain also became the first woman to win a prize from the Paris Academy of Sciences, for writing about elasticity theory. Today that prize is known as the Sophie Germain Prize.


Thomas Phillips via Wikipedia // Public Domain

Mary Somerville (1780–1872) was born in Scotland, and was not particularly interested in academics as a child—she only attended school for a year. However, when she encountered an algebra symbol in a puzzle at age 16, she became fascinated with math and began studying it on her own. Her parents tried to discourage her, worried that her intellectual preoccupations might drive her insane. (At the time, a popular theory held that difficult study could damage a woman’s mental health.) But Somerville continued to study, teaching herself Latin so she could read earlier versions of works by Euclid.

She also corresponded with William Wallace, a professor of mathematics at Edinburgh University, and solved mathematical problems posed in contests, winning a silver prize in 1811.

Somerville’s first husband did not encourage her interests, but when he died, she remarried. Her second husband, Dr. William Somerville, an inspector of the Army Medical Board, was proud of her work in mathematics and astronomy. For her work translating a book titled Celestial Mechanics and adding commentary, she was named an honorary member of the Royal Astronomical Society.

Physicist Sir David Brewster called her “certainly the most extraordinary woman in Europe—a mathematician of the very first rank with all the gentleness of a woman.” When John Stuart Mill petitioned the British government for women’s votes, he filed his petition with Somerville’s signature first. She was proof that women were men’s intellectual equals.

Alfred Edward Chalonvia Wikipedia // Public Domain

The next time you download some electronica, you may want to remember Augusta Ada King-Noel, Countess of Lovelace (1815–1852). Lovelace was born during the brief marriage of poet George, Lord Byron and Anne Milbanke, Lady Wentworth. Her mother did not want her to be a poet like her father and encouraged her interest in mathematics and music. As a teenager, Ada began to correspond with Charles Babbage, a professor at Cambridge. At the time, Babbage was working on his ideas for a calculating machine called the Analytical Engine, now considered a precursor to the computer. Babbage was solely focused on the calculating aspects, but Lovelace supplied notes that helped envision other possibilities, including the idea of computer-generated music.

Lovelace also translated an article about the Analytic Engine by French mathematician Louis Menebrea. Her notes include an algorithm showing how to calculate a sequence of numbers, which forms the basis for the design of the modern computer. It was the first algorithm created expressly for a machine to perform.

Lovelace was a countess after her marriage, but she preferred to describe herself as an analyst and a metaphysician. Babbage called her “the enchantress of numbers”—but she might also be called the world’s first computer programmer.

Florence Nightingale (1820–1910) is best known as a nurse and social reformer, but a lesser-known contribution of hers continues to save lives. In her efforts to improve the survival rates of hospital patients, Nightingale became a statistician.

When the “lady with the lamp” returned from service during the Crimean War, she expressed sadness about how many soldiers had become sick and died while lying in the hospital. “Oh my poor men, who endured so patiently,” she wrote to a friend. “I feel I have been a bad mother to you to come home and leave you lying in your Crimean graves.”

As part of her plan to reform hospital care, Nightingale began gathering statistics. The figures she gathered indicated that a lack of sanitation…

The Fempire Strikes Back: Meet the Women Who Slayed the Astronomy Game and Charted the Stars

The commercial and critical success of 2016’s Hidden Figures drew much-needed attention to the all-but-forgotten, amazing tale of Katherine Johnson, Dorothy Vaughn, Mary Jackson, and the other NASA “computers” who played a significant role in America sending men into space- which is both needed and thrilling…but what if I told you that they weren’t the first women to defy the odds and revolutionize their field of study?

It’s true. In the late 1800’s, the Harvard Observatory was busy amassing photographic plates of the stars – not only from North America, but Peru, South Africa, New Zealand, and Chile. In the Andes, Harvard astronomers ferried the plates packed in crates down a mountain on the backs of mules. Once the data returned to Harvard, Edward Pickering, the man in charge of the Observatory, realized he would need a ton of help to catalogue and analyze the massive influx.

But that’s not the surprising part. The surprising part is, in the 1880s, he collected a team of women to do the job.

Pickering had an undergraduate degree from Harvard and left to teach physics at MIT for a brief stint before returning as the director of the Harvard College Observatory in 1877. It didn’t take long for him to grow frustrated with his male staff, who he felt was lacking in performance and innovation. Legend has it that he said his maid could do a better job – so he hired her (truly!) to oversee his new, all-female team of computers.

The majority of these women came with college…