Zero Shadow Day is a celestial event twice a year. In this event, no shadow of any object or person is observed. This event occurs on a specific date and time and has a short lifespan. This year, a zero-shadow day will be observed in Bangalore at 12:17 pm on April 24, 2025.
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What is Zero Shadow Day?
When the sun is placed precisely above the head at noon locally, a zero-shaded day occurs, resulting in the vertical object being left without shadow for a short period of time. This phenomenon is only possible between the tropics of cancer (23.5°N) and Capricorn (23.5°S), where the obvious path of the sun in the sky can be perfectly aligned with Zenith (directly above the observer).
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- Why does this happen? The axis of the earth is inclined at about 23.5 degrees from the orbit around the sun. This tilt causes the sun position that changes northward in the sky during the year when the earth rotates. At twice a year, for points in the tropical region, the sun’s rays are perpendicular to the ground at noon locally, destroying the shadows on vertical objects.
Every part of the tropical region has two zero-shadow days each year: one is north-north (between the vernal equinox and June winter solstice), while the other is south (between the vernal solstice and September in June).
Bangalore’s Shadow Day
Bengaluru is around 13°N latitude and sees zero shadow days every six months. In 2025, it will fall around April 24-25 and then reappear on August 18. During these two days, between 12:17 and 12:23 PM, the sun is just overhead, and vertical objects (such as poles, trees and even humans) will not cast a shadow on the ground.
How to celebrate?
This phenomenon can be observed by both citizens and stargazers by placing vertical sticks or any standing object at a given time. In a few minutes, the shadow will completely decrease and disappear, only reappearing on the other side as the sun continues to move forward.
Is Zero Shadow Day a special feature of Bengaluru?
Zero Shadow Day is not specific to Bengaluru. It can be observed in the tropical areas of cancer and in the tropical areas of Constellation, but the exact date and time vary depending on the latitude of each place.
Example of zero-shadow date in Indian city
|
City |
Zero Shadow Day (2025) |
Local noon time |
|
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April 10 and September 1 |
12:21, 12:22 |
|
Bengaluru |
April 24 and August 18 |
12:17, 12:25 |
|
Hyderabad |
May 9 and August 5 |
12:12, 12:19 |
|
Mumbai |
May 15 and June 27 |
12:34, 12:45 |
|
Bhopal |
June 13 and June 28 |
12:20, 12:23 |
This means that cities in southern and central India (such as Hyderabad, Mumbai, Kanyakumali and Bhopal) also witnessed zero shadow days, but at different dates and at slightly different times, determined by their latitudes.
A broader meaning
Zero Shadow Day is not just curiosity, it is a vivid proof of the earth’s axial inclination, the geometry of sunlight and the movement of celestial bodies. It also has practical applications in architecture and solar energy, as understanding the path of the sun is crucial to designing buildings and solar panels.
“The Zero Shadow Day not only provides a miracle, but also serves as an educational opportunity to highlight the complex movement of celestial bodies. It will demonstrate the accuracy of the tilt of our planet and its consistent path around the sun, an important event for astronomy enthusiasts.”
Source: https://dinhtienhoang.edu.vn
Category: Optical Illusion