Tag Archives: circumference


The next guy to visit the New World was Amerigo Vespucci (vess-POOCH-y) from Florence, Italy. Amerigo was a navigator, a mapmaker, a trader and astronomer. During one of his trips he calculated the circumference of the Earth (how big around at the Equator)—and was off by only 50 miles!

Amerigo Vespucci was also a writer and promoter. If Columbus didn’t realize how big the New World is, Vespucci surely did. He wrote pamphlets (short, easy-to-read) to tell people about the New World and all it had to offer. Vespucci promoted the New World to Europe. Promotion, gang. Amerigo Vespucci did such a good job of promoting the New World that a German mapmaker named the newly-discovered continents for Amerigo—North America and South America—and it caught on.

It’s a tradition to name continents in the feminine form—Asia; Africa; Europe (Europa to the people who live there); India; Australia; Antarctica. So the boy’s name Amerigo became the girl’s name America.

How do people promote nowadays? Writing a pamphlet was the way to go in Vespucci’s time. How would you promote something big that you wanted everybody to know about?

The well at Syene

So how did Eratosthenes figure out how big around the Earth is? Here’s how:

First, he assumed the Earth is round like a ball.

Well at Syene.

Second, he knew several things about a little town called Syene. It is 5,000 stadia (575 miles or 925 kilometers) directly south of Alexandria. There was a well in the center of town, dug deep and plumb—straight toward the Earth’s center. At noon on June 21st, the Summer solstice, you could see the Sun reflected on the water way down in that well, which means the Sun is directly overhead.

Bird’s-eye view of the Sun’s reflection in the well at Syene.

That’s because Syene is located on the Tropic of Cancer. If you happen to be standing on the Tropic of Cancer and it’s noon where you are on June 21 you can draw a straight line from the center of the Earth, through the Tropic of Cancer, to the Sun.

A stadion is an ancient Greek unit of measurement—it’s 600 feet (an eighth of a mile). Stadion is singular (nominative, singular, second declension); stadia is plural (nominative, plural, second declension). 5,000 stadia = 575 miles or 925 kilometers. I hope I declenched in all the right spots. Many thanks to my Greek-scholar pals Jackie J., Michele J. & Joann W!