The residents of Bhubaneswar witnessed a 'zero shadow day', a celestial event, in the city on Friday, May 21. Zero shadow day is a special celestial event that occurs twice a year. During this time, no shadows appear of any object or living being when the sun is at its highest point in the sky.

Deputy Director of Pathani Samanta Planetarium, Subhendu Patnaik said, "Many people witnessed 'zero shadow day'. It occurs twice a year when the sun is directly overhead. We experienced it today."

"We don't need equipment to see the event but we 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," he said through a virtual conference.

“The phenomenon takes place as the rotation axis of the Earth is tilted at an angle of 23.5° to the axis of revolution around the Sun. When the location of the Sun moves from 23.5° N to 23.5° S of Earth’s equator, all places whose latitude equals the angle between the location of the Sun and the equator will experience Zero Shadow Days,” explained Patnaik. It is told that the 'zero shadow day' can be expected to experience in Cuttack on Saturday.

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