Who was Anaxagoras? - Biography of the Greek Philosopher Anaxagoras
Quatr.us answers questions

Who was Anaxagoras?

Clazomenae coin
A coin from Clazomenae (front and back)

Like Thales before him, Anaxagoras was born in what's now Turkey. Anaxagoras was born around 500 BC in a city called Clazomenae, in the Persian Empire. When he was a child, Clazomenae participated in the Ionian Revolt and soon became part of the Athenian Empire.

Anaxagoras seems to have been born into a rich family, and he probably went to school, but later he chose to be poorer so he could spend his time studying instead of running his family's business. When Anaxagoras grew up, he went to Athens, which was essentially his capital city. He lived in Athens most of his life. He became friends with Pericles and Euripides, and he must have known Socrates.

Anaxagoras' most important idea was that people should not trust their senses (seeing and hearing) or their common sense to tell them about the world, but they should always use logic and reason to figure out the truth instead.

Sometimes this idea led Anaxagoras to some funny conclusions. For instance, he said that snow must have some darkness in it, as well as whiteness, or how could it turn into dark water when it melted? But he was able to use his logic to figure out correctly what caused eclipses.

Anaxagoras' ideas upset a lot of people in Athens who said he didn't believe in the Greek gods (and maybe he didn't). He was arrested, and only escaped being sentenced to death by the jury because his friend Pericles helped him. He had to leave Athens, and he died soon after in Lampsacus (near Troy), about 428 BC. Only fragments of the books Anaxagoras wrote survive today - most of them were lost or destroyed.

Almost a hundred years later, Aristotle said that he had gotten the beginnings of his science from Anaxagoras' work.

Learn by doing: watch an eclipse
More about Aristarchus

Bibliography and further reading about Anaxagoras:

Greek and Roman Science, by Don Nardo (1998). Nardo has written a lot of good books about the ancient world for kids; this one is no exception.

Ancient Science: 40 Time-Traveling, World-Exploring, History-Making Activities , by Jim Wiese (2003). Activities, as the title says - how to make your own sundial, and so on. The author is a science teacher.

Early Greek Science: Thales to Aristotle, by Geoffrey Lloyd (1974).

History of Greek Mathematics: From Aristarchus to Diophantus, by Thomas L. Heath (1921, reprinted 1981). A lot of Euclid, but also describes who the other major Greek mathematicians were and what they did.

Episodes from the Early History of Mathematics, by Asger Aaboe (1997).

Other mathematicians:

Aristotle, Anaxagoras, Euclid, Pythagoras, and Aristarchus.

More about Greek astronomy
Ancient Greece
Quatr.us home

Professor Carr

Karen Eva Carr, PhD.
Assoc. Professor Emerita, History
Portland State University

Professor Carr holds a B.A. with high honors from Cornell University in classics and archaeology, and her M.A. and PhD. from the University of Michigan in Classical Art and Archaeology. She has excavated in Scotland, Cyprus, Greece, Israel, and Tunisia, and she has been teaching history to university students for a very long time.

Professor Carr's PSU page

Help support Quatr.us!

Quatr.us (formerly "History for Kids") is entirely supported by your generous donations and by our sponsors. Most donors give about $10. Can you give $10 today to keep this site running? Or give $50 to sponsor a page?

For the US election, check out Quatr.us' page on the Constitution. From the Revolution on, people have fought for the right to vote. In the 1800s, Andrew Jackson got poor white men the vote; the Civil War and Lincoln brought the vote to African-American men. In the 1900s, women got the vote, and Martin Luther King Jr. fought to force white people to actually let black people vote.