The Birla Planetarium organised an event to demonstrate this phenomenon, where they placed a plate with alphabets on it, and as the Sun moved away from its zenith, the alphabets began to fade away. This phenomenon occurs due to the fact that the shadow of any vertical body is present below it and not visible on a Zero Shadow day. Zero Shadow Day in Hyderabad 2023: Telangana Capital Witnesses Rare Celestial Phenomenon for Brief Period on May 8.