5. Eratosthenes was a Greek scholar who lived in the third century BC. He came up with a clever way to indirectly measure the circumference of the Earth. Eratosthenes knew that in Aswan the sun was directly overhead at noon on the summer solstice At the same time, he measured the angle of the sun to a vertical line in Alexandria. He found th angle to be 1 50 of a circle. Alexandria . 1 circle 50 sunlight Alexandria Aswan Egypt centre of the Earth Aswan. http://en wikipedia.org/wiki/File: Egypt_location_map svg=filelinks a. What was Eratosthenes's measurement in degrees? (Hint: There are 360 in a complete circle.)