the sun is many times bigger than the earth

 

Because the sun is many times bigger than the earth. Even if the sun were thought to be smaller than the earth at that time due to a lack of knowledge, its size would still be quite large, and its light would surely fall directly on the earth. In order for a shadow to form, the path of the light source must be tilted. Otherwise, the light-receiving card must be tilted. So now that the light source is not tilted, the only thing that remains is the tilt that accepts the light.

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