Eratosthenes Question

Question 1

Observations:

Answer 1

There was no shadow in syrene at midday however at midday in alexandria the same day (on a different year) the angle of elongation was 7 degrees. Syrene was due north of Alexandria and 5000 stadia away.

Question 2

method:

Answer 2

360/7 = 51.4

51.4 *5000 = 257 000 (47 500km) this was the circumference of the Earth.