Eratosthenes and the Circumference of the Earth

What technological advancement in the mid-20th century helped us measure the Earth's circumference?

• The creation of the globe

• The development of the compass

• The launch of satellites

• The invention of the telescope

What did Eratosthenes observe in Syene that was crucial for his experiment?

• The sun was directly overhead at noon

• The moon was visible during the day

• The stars were brighter than in Alexandria

• The temperature was significantly higher

Why did Eratosthenes conclude that the Earth's surface is curved?

• Because the moon appeared larger in Syene

• Because a stick in Alexandria cast a shadow while one in Syene did not

• Because the sun's rays were hotter in Syene

• Because the stars moved differently in Alexandria

How did Eratosthenes determine the distance between Alexandria and Syene?

• By pacing the distance

• By measuring the time taken to travel

• By using a compass

• By using a map

What was the approximate circumference of the Earth calculated by Eratosthenes?

• 30,000 kilometers

• 35,000 kilometers

• 40,000 kilometers

• 45,000 kilometers