Eratosthenes determined the circumference of Earth by conducting an experiment. Put his steps in order as they correlate to the scientific method. Draw Conclusions: The angle represents the amount Earth curves between Syene and Alexandria. This is 1/50 of a complete circle and 1/50 of Earth's circumference. ty Conduct an Experiment: Measure the angle of a shadow at high noon in Syene and Alexandria. tu Make Observations: In Syene, the sun's rays are vertical at noon. At the same time in Alexandria, the rays are 7.2 degrees from the vertical.​