The parallelism of the solar rays

The concept of parallel rays and divergent rays, in relation to the light source, is necessary to validate hypothesis 2 of Eratosthenes.


validate hypothesis 2 of Eratosthenes


Observe the parallelism of the shadows of lined up gnomons.


Draw the sunrays and edit a Gif animated, 

Hypothesis 1: 

The Earth is flat and the Sun is close 

Hypothesis 2: 

The Earth is curved and the Sun is very far away. 

Parallelism of the solar rays (for a distant source)  2019 photos

2021 photos

2022 photos