Using a vertical stick planted on the ground, ancient astronomers could determine accurately the daily paths of the Sun. The fact that people from different parts of the Earth saw different daily paths of the Sun led to the idea that the Earth may not be flat.
CITATION STYLE
Kwok, S. (2017). A Spherical Earth. In Our Place in the Universe (pp. 33–48). Springer International Publishing. https://doi.org/10.1007/978-3-319-54172-3_5
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