The concept of parallel rays and divergent rays, in relation to the light source, is necessary to validate hypothesis 2 of Eratosthenes.
Hypothesis 1: The Earth is flat and the Sun is close | | Hypothesis 2: The Earth is curved and the Sun is very far away. |
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Observations
parallelism of the solar rays (for a distant source)
2019 photos with Aigio, Athens, Ioannina, Petroupoli, Busteni, Ubeda, Rio de Janeiro, Jajjah Abbasian