Eratosthenes determined the circumference of earth by conducting an
experiment. put his steps in order as they correlate to the scientific method.
conduct an experiment: measure the angle of a shadow at high noon
in syene and alexandria.
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.
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make a hypothesis: if the sun casts shadows at different angles at
the same time of day in different places, we can determine how much
earth curves.