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Spherical Earth or Earth's curvature refers to the approximation of the figure of the Earth as a sphere. The earliest documented mention of the concept dates from around the 5th century BC, when it appears in the writings of Greek philosophers. In the 3rd century BC, Hellenistic astronomy established the … See more
The spherical shape of the Earth was known and measured by astronomers, mathematicians, and navigators from a variety of literate ancient cultures, including the … See more
• Janice VanCleave (2002). Janice VanCleave's Science Through the Ages. John Wiley & Sons. ISBN 9780471208303.
• Menon, … See moreWikipedia text under CC-BY-SA license WEBSpherical Earth, refers to any figure of Earth as represented by a sphere. Although other models, including the geoid model (which is based on approximations of Earth’s gravitational field) and the ellipsoid model …
c. 500 BCE: Pythagoras and the Spherical Earth
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