PREVIEW
... ory and the flat Earth theory has always been a highly controversial topic.
Previously, when introducing Zhang Zai, the origin of the round Earth theory was mentioned:
It is generally believed that the round Earth theory officially appeared in the 6th century BC.
That is when the Ancient Greek mathematician Pythagoras first proposed the concept of the Earth.
Then by the 3rd century BC.
The scientist Eratosthenes, living in Alexandria, established the conce ...
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