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Galileo's Battle for the Heavens

His Life

 

Galileo homepage

In the scientific firmament, Galileo's star shines as brightly as that of Newton or Einstein. Yet how many of us know much about his life beyond his interest in the heavens and his troubles with the Church (which Pope John Paul II officially ended in 1992, 350 years after Galileo's death)? In this timeline, turn back the clock to the late Italian Renaissance and relive the dramatic life of one of history's foremost scientific geniuses. — Lexi Krock



1564

 

Galileo Galilei is born in Pisa on February 15. He is the first child of Vincenzo Galilei of Florence, a music teacher, and Giulia degli Ammannati of Pescia.

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1579

 

Galileo studies Greek, Latin, and logic at the Benedictine monastery of Santa Maria di Vallombrosa and considers becoming a monk until his father expresses displeasure at the idea.



1581

 

Galileo begins his studies in September at the University of Pisa, where he studies medicine and mathematics. Though he is a diligent medical student, mostly to satisfy his father's wish that he become a doctor, Galileo prefers mathematics.



1585

 

Galileo, now 21, leaves the University of Pisa without a degree after four years of study. He spends the next four years giving private lessons in mathematics in Florence and Siena.

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1589

 

Galileo takes a teaching position at the University of Pisa. He refuses to wear the standard academic regalia, a black robe, dismissing the sartorial tradition as pretentious and cumbersome. University officials repeatedly impose fines on him for this transgression.



1591

 

Galileo's father dies at 70, and Galileo becomes the primary financial provider for his family, which includes his mother, his married sister Virginia (whose dowry requires regular payments), his 16-year-old brother Michelangelo, and his unmarried sister Livia. Three other siblings died during childhood.



1592

 

In December, Galileo becomes chair of the mathematics department at the University of Padua in the Republic of Venice. He gives lectures on geometry and astronomy in addition to private lessons on Euclid, cosmography, and other subjects.

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1595

 

Galileo develops his theory of the tides, asserting that they ebb and flow in relation to the Earth's diurnal and annual movements. His theory, though elegantly conceived, is incorrect (see His Big Mistake).



1597

 

Galileo invents a geometric and military compass, which has a commercial use as a pocket calculator. He hires a full-time instrument maker to mass-produce the compass, publishes a companion manual to the instrument, and gives lessons on its use.

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1599

 

Galileo, 36, begins a relationship with 22-year-old Marina Gamba of Venice.



1600

 

In August, Galileo and Marina Gamba's first daughter, Virginia, is born out of wedlock.



1601

 

In August, Livia, Galileo and Marina Gamba's second child, is born almost exactly one year after her sister.



1602

 

Galileo conducts experiments with a pendulum on the measurement of time increments (see His Experiments: Pendulum). He explains his findings in a letter to Santorio Santorio, a doctor friend in Venice, who then successfully uses a pendulum to measure his patients' pulses.

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1607

 

Marina Gamba gives birth to Vincenzio, Galileo's only son, in August.



1609

 

In May, Galileo learns of the invention of telescopic lenses in the Netherlands, which can be used to see objects at a distance. Within a month, he creates his own three-powered telescope (see His Telescope).

Throughout the summer and fall Galileo continues to work on his telescope and begins to observe the night sky through it. He presents an eight-powered telescope to the Senate in Venice and is awarded tenure at the University of Padua.

From November 30 to December 19, Galileo observes the moon through his telescope.

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1610

 

On January 7, Galileo sees three bright stars near Jupiter; six days later he spies a fourth. Within a week he determines these are Jupiter's satellites.



1611

 

In Rome, Jesuit mathematicians at the Collegio Romano certify Galileo's celestial discoveries, which include Saturn, sunspots, and the satellites of Jupiter, among other things.

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1612

 

Galileo publishes Bodies That Stay Atop Water or Move Within It in Florence.



1613

 

Galileo publishes his Sunspot Letters. Virginia and Livia Galilei, Galileo's daughters, enter the Convent of San Matteo in Arcetri. They both take the habit within a year.

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1614

 

Tommaso Caccini, a Dominican friar, delivers a sermon in Florence in which he denounces as heretics Galileo and others who subscribe to the Copernican view of the heavens (that the Earth revolves around the sun and not the other way around). Shortly thereafter, one of Caccini's superiors sends Galileo a written apology. Later this year, Caccini is deposed by the Roman Inquisition.



1616

 

In January, Galileo writes about his theory of the tides, arguing that it proves the movement of the Earth and the central position of the sun. He addresses his writing to Cardinal Alessandro Orsini.

Pope Paul V orders Robert Cardinal Bellarmine, the so-called "hammer of the heretics," to warn Galileo against defending Copernican theory.

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1619

 

Marina Gamba dies in February. She and Galileo were never married and never lived under the same roof.



1620

 

Galileo's mother dies in September at the age of 82.



1623

 

In February, Roman censors give permission for Galileo's book The Assayer to be printed. The book serves as a retort to Orazio Grassi, a teacher of mathematics, on the subject of comets, including their weight and composition, and meditates on the primacy of experimental science over the opinions of the popular majority.



1624

 

Galileo travels to Rome, where he has audiences with Pope Urban VIII and several cardinals. The Pope grants Galileo permission to address Copernican theory in his writing on the condition that he only lend it the weight of a hypothesis.

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1630

 

Galileo finishes his work in April for Dialogue Concerning Two Chief World Systems, which includes his treatise on the tides. It is published two years later.



1632

 

Pope Urban VIII suspends distribution of Galileo's Dialogue and appoints a commission to examine the book. The case is referred to the Inquisition, and Galileo is summoned from Florence to Rome.

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1633

 

In April, the Inquisition formally interrogates Galileo, who has been detained in the building of the Inquisition for several weeks. Galileo agrees to plead guilty in order to receive a lenient sentence, and on April 30 he confesses that he advocated Copernican theory too vigorously in the Dialogue. He agrees to modify his opinions in his next work.

In June, the Pope orders Galileo imprisoned indefinitely under house arrest. Galileo makes his way back to his villa in Arcetri, near Florence, where he spends the remainder of his life under house arrest.

Galileo begins work on his Discourse Concerning Two New Sciences.

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1634

 

Galileo's daughter Virginia, known as Sister Maria Celeste, dies in the Convent of San Matteo in April.



1637

 

Galileo, in failing health for several years, loses his eyesight. He petitions the Inquisition to be freed for medical reasons. His request is denied but in March the Inquisition gives Galileo permission to attend religious services on holidays.



1638

 

Discourse Concerning Two New Sciences is published in Holland.



1641

 

Galileo conceives of a pendulum-controlled clock.



1642

 

Galileo dies in Arcetri on January 8. Isaac Newton is born in England on December 25.

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Other Lives of Luminaries

Einstein Einstein Timeline
Explore the turning points in Einstein's life.




Galileo Web Site Content
His Life

His Life
An illustrated chronology of Galileo's life.

 

His Place
In Science

Why Galileo is the father of modern science.

His Telescope

His Telescope
(and Sir Isaac's)

On Galileo's refractor and Newton's reflector.

 

His Big Mistake
How and why Galileo got it wrong about the tides.

Pendulum

His Experiments
Falling objects, inclined planes, and more.



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