![]() ![]() ![]() Aristarchus‘ observations of Earth’s shadow on the moon during lunar eclipses.Eratosthenes‘ measurements of sunlight down wells in two different cities.Looking at ships or boats on the horizon with binoculars.Listen as Thaller describes three observable ways that humans have come to know that we live on a sphere, or specifically, an irregularly-shaped ellipsoid: The ancient Greeks actually had a number of really elegant, wonderful proofs that the Earth was a sphere. …people have known of this for way more than 2,000 years. So how do we know the Earth is round? Watch this 2018 Big Think explainer: Three proofs that debunk the flat-Earth theory. ![]() Michelle Thaller, astronomer and science communicator with the NASA Goddard Space Flight Center. This is not a viable argument,” explains Dr. “It’s not okay to think that the Earth is flat. ![]()
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