Zero Shadow Day: Bengaluru To Observe It On April 25; All Details About The Phenomenon

Zero Shadow Day is a unique phenomenon when no object casts a shadow despite standing in the sun. Bengaluru is observing it on April 25, and it will witness it again in August. 

zero shadow day bengaluru april

Have you ever heard about the ‘zero shadow day’? The unique celestial phenomenon will be observed in Bengaluru today (April 25). As the name suggests, no object in the city will have a shadow today. According to reports circulating around the internet, it will start at 12.17 PM.

The Indian Institute of Astrophysics (IIA) in the city will celebrate this day by organising events on the premises. Its official tweet read, “Come celebrate Zero Shadow Day #ZSD at our Koramangala campus on April 25 from 10 AM - 1 PM. Sun will be directly overhead at 12.17 PM.”

Details About The Zero Shadow Day

We see shadows forming because the sun (Home Remedies To Repair Sun Damage) is never overhead. It always transits at a low altitude, either a bit towards the north or south.

According to the Astronomical Society of India (ASI), for people who live between +23.5 (Tropic of Cancer) and -23.5 (Tropic of Capricorn) degrees latitude, the declination of the Sun is usually equal to twice their latitude. It will happen once during Uttarayan (north movement) and once during Dakshinayan (south movement).

However, the sun will be directly overhead in Bengaluru. Therefore, it will cast no shadow on any object. At this point, the declination of the sun will be equal to the latitude of the location. It will happen for a second only, but people will be able to observe it for about a couple of minutes. Bengaluru will again observe it on August 18.

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The places that are closer to the equator have experienced this phenomenon around March 20 (the Vernal Equinox). They will again observe it around September 22 (the Autumnal Equinox).

Every year, astronomical enthusiasts observe this day by standing in a circle and clicking pictures. They watch their shadows disappear and appear again. Some people place objects like PVC pipes, water bottles (Increase Water Intake In Summer), and paper with holes and ladles to observe this unique phenomenon.

Twitter Reactions

Salem in Tamil Nadu observed Zero Shadow Day on April 20. The official page of the Tamil Nadu Astronomical and Science Society (TASS) shared an image of school kids standing in circles.

A Twitter user shared an image of people standing in a circle to observe Zero Shadow Day. The caption read, “Vertical objects in the city will not be having shadows for a brief period of time on April 25.”

Nabila Jamal shared a photo of a bicycle. Her tweet read, “Get ready to witness an extraordinary sight in Bengaluru as Zero Shadow Day approaches. April 25th, all vertical objects in the city will be shadowless at 12.17 PM, as the sun will be directly overhead.”

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