Nepedia
Back to Discover
Fluent Reader
📖

Thales of Miletus

philosophy religion Maturity 9-11 death dying Next article →

This article covers sensitive topics: death_dying. Parents can manage visibility in Parental Controls.

Thales of Miletus was a very famous thinker from Ancient Greece.

Tales de Mileto (1906) - Veloso Salgado
Tales de Mileto (1906) - Veloso Salgado

He lived in a city called Miletus, which sat near a river in a place called Ionia. Many historians consider him the very first philosopher in the Greek tradition. Before Thales, people often used myths and stories about gods to explain nature. Thales tried a different way of looking at the world. He used natural ideas and logic to understand how things worked.

Nuremberg chronicles f 59r 2
Nuremberg chronicles f 59r 2

This new way of thinking is called natural philosophy.

Thales had many interesting ideas about the world around him.

Floating Earth Thales Anaximander
Floating Earth Thales Anaximander

He believed that one single substance made up everything in nature. He thought this main substance was actually water. He also believed that the Earth itself floated on top of water. In math, he used clever rules to solve problems. He is known for a rule called Thales's theorem.

Thales' Theorem Simple
Thales' Theorem Simple

People say he used math to measure the height of pyramids. He could even figure out how far ships were from the shore.

We know a little bit about his life from writers who lived much later.

One writer named Diogenes Laërtius wrote about him in the third century AD. We do not know the exact years Thales was born or died. Some people think he was born around 625 BC. He was part of a group called the Seven Sages. These were famous wise leaders in Ancient Greece. Thales was even called the first of these sages. He was linked to the famous saying, "know thyself."

Thales was also a scientist who studied the sky and the weather.

Solar eclipse 1999 4
Solar eclipse 1999 4

He was an astronomer who could predict when a solar eclipse would happen. He reportedly predicted an eclipse in the year 585 BC. He also studied the stars and the seasons. He helped people understand the position of the constellation Ursa Major. Thales was even a clever engineer.

Kızılırmak River from Kapıkaya Köyü
Kızılırmak River from Kapıkaya Köyü

He helped the Lydian army cross the Halys River. This showed he could use his smarts to help people in real life.

Many people wonder where Thales learned his great ideas.

All Gizah Pyramids
All Gizah Pyramids

Some think he traveled to Egypt to study math and geometry. Others wonder if he learned from people in Babylonia. It is hard for historians to know for sure if he traveled there. Regardless, his work changed how people thought about the universe. He moved thinking from just wondering to actually practicing science. His ideas about how everything is connected were very important. He helped start a long tradition of asking big questions about life.

416 words

Where will your curiosity go next?

Keep exploring at your chosen reading level.

🖼️ Images & Media (14)
File:MiletusIonicStoa.jpg
MiletusIonicStoa.jpg
File:Griechischen und phönizischen Kolonien.jpg
Griechischen und phönizischen Kolonien.jpg
File:All Gizah Pyramids.jpg
All Gizah Pyramids.jpg
File:Nuremberg chronicles f 59r 2.png
Nuremberg chronicles f 59r 2.png
File:Ostia, Baths of the Seven Sages (II) (4687819515).jpg
Ostia, Baths of the Seven Sages (II)...
File:Thales' Theorem Simple.svg
Thales' Theorem Simple.svg
File:Thales theorem 1.png
Thales theorem 1.png
File:Canova - Urania, the Muse of Astronomy Reveals to Thales the Secrets of the Skies, 1798-1799 (crop).jpg
Canova - Urania, the Muse of Astronomy...
File:Floating_Earth_Thales_Anaximander.svg
Floating_Earth_Thales_Anaximander.svg
File:Capernaum roman olive press by David Shankbone.jpg
Capernaum roman olive press by David Shankbone.jpg
File:Solar eclipse 1999 4.jpg
Solar eclipse 1999 4.jpg
File:Kızılırmak River from Kapıkaya Köyü.jpg
Kızılırmak River from Kapıkaya Köyü.jpg

+ 2 more

More to explore

🔬 Go deeper

More advanced topics to explore

🪜 Step back

Simpler topics to build understanding

What is Nepedia?

A free, ad-free encyclopedia for children. Every article is written at five reading levels, so the same page works for a five-year-old and a fifteen-year-old — use the level switcher above to see this one change. No account needed to read.