On 21st May, residents of the Odisha’s state capital witnessed a Zero Shadow Day. It is a rare celestial phenomenon during which no shadow of an object or a being is observed. The phenomenon occurs twice a year when the sun is at its highest point in the sky at all the regions between the Tropic of Cancer and the Tropic of Capricorn. Due to the sun being exactly overhead, the shadow of all beings or objects disappears, resulting in Zero Shadow Day. To test this phenomenon, no equipment is required. You can use a white paper and place it on a flat ground, keep some vertical object like a bottle on it and study the movement of its shadow.
June 10, 2021