"You are all correct," Risu said, nodding, "although the exact positions of Syene and Alexandria were probably the smaller problem. As you've pointed out," he nodded in the direction of the Head Boy, "distance measurements on land were very unreliable. Nowadays, with satellites and aeroplanes, measuring the distance between two points on Earth is rather trivial. But in the time of Eratosthenes, a linear distance was extremely difficult to procure. But even so, Eratosthenes' estimate was valid for a very long time, and it's one of the most famous scientific experiments of the entire ancient world."
He clapped his hands. "And with that, we shall conclude this lesson. Homework... is on the board." He flicked his wand over his shoulder, and writing appeared. "An essay on your evaluation of the scientific method, or, if you are artistically inclined, a detailed sketch and explanation of Eratosthenes' famous experiment." He dropped his wand on the desk. "Thank you all for coming. If you have any questions about the lesson or your homework, I'll be available in my office."
Risu began gathering his things.
Homework
Choose
one:
Write a short essay discussing the merits and limitations of the scientific method. (3+ paragraphs)
Give a detailed explanation, including an original drawing, of Eratosthenes' calculations of the circumference of the Earth.
Homework can be handed in until 11.59pm GMT on Saturday, 29 May. This assignment is worth up to 15 points. OOC: Make sure to read the submission guidelines carefully.