Zero Shadow Day: When Reality Gets a Little Too Unreal

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Can you tell what is real and what isn't? The video explores why a computer-generated image can appear more real than real ones, focusing on the importance of shadows.

Zero Shadow Day occurs when the Sun is exactly overhead at solar noon, causing vertical objects to cast no shadow. This phenomenon happens twice a year for locations between the Tropic of Cancer and the Tropic of Capricorn. It is due to the Earth's axial tilt and orbit around the Sun. On these specific days, the Sun's rays strike the ground at a 90-degree angle, meaning the direction of the sunlight aligns perfectly with the vertical object, eliminating its shadow. This is a striking illustration of Earth-Sun geometry in action.


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