If the Sun were as close to the Earth as the Moon, the shadows would appear significantly different compared to what we observe currently.
Currently, sunlight reaching Earth can be approximated as parallel rays because the Sun is extremely far away compared to the size of the Earth. This approximation allows us to perceive sharp, well-defined shadows. However, if the Sun were as close as the Moon, the rays of light would diverge significantly before reaching the Earth's surface.
In such a scenario, the light would no longer appear parallel, and the shadows would exhibit a more diffused or blurred appearance. This is because the diverging rays of light would lead to more significant overlap and mixing of light in the shadowed regions. Consequently, the boundaries of shadows would be less defined, resulting in a smoother transition between the illuminated and shadowed areas.
Moreover, the apparent size of the Sun would be much larger in the sky, similar to how we see the Moon, which would further affect the distribution and shape of shadows. Shadows would likely appear larger and less crisp due to the increased size of the light source.
It's worth noting that this hypothetical scenario assumes that the Sun's characteristics, such as its luminosity and size, remain unchanged despite being closer to Earth. In reality, if the Sun were as close as the Moon, its proximity would significantly affect its gravitational pull and likely lead to significant disturbances in Earth's environment.