The Science Connect TV Outreach - What is a Zero Shadow Day ?
Zero Shadow Day is a celestial phenomenon that occurs twice a year in locations between the Tropic of Cancer (23.5°N) and Tropic of Capricorn (23.5°S). During this brief event, the sun reaches its highest point directly overhead at noon, causing vertical objects to cast no shadows.
This phenomenon is a consequence of Earth's tilt on its axis (23.5°) and its revolution around the sun. The tilt creates an apparent seasonal shift in the sun's position in the sky. Twice a year, for locations within the tropics, the sun's path aligns perfectly overhead, eliminating shadows for vertical objects for a short period.
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