Zero Shadow Day – India 2020

Zero Shadow Time, when no traces of the actions on the earth exists. It could be the vision of the digital world; however, in this physical world, we can enjoy only Zero Shadow Day, that too twice a year.

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Sun, the celestial body, the visible astronomical object creates a shadow for any solid object on the earth. Light and shadow are the two pairable entities on the planet, except for the time when they meet vertically at 90 degrees in between the location of Tropic of Cancer (+23.5°) and Tropic of Capricorn (-23.5°). The 23.5° tilted earth (reason of different seasons) and the sun’s path in the sky results in many astronomical events and causes for this existence. Solstice and equinox are the apparent changes that design the seasons on the earth. While the path of the Sun from December solstice (21 or 22) of the month) to June solstice (20 or 21 of the month) and vice-versa results in the exact parallel to the earth. The region in the tropical latitudes (+23.5° to +23.5°) experiences that at a specific time, the sun approaches the point directly overhead (zenith). 

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Twice a year, this occurs in the tropical latitudes. In India, most of the places can see this event. The sun and the earth are parallel at the time of the day, and there will be no shadow on the planet, which represents the Zero Shadow Day.

To enjoy this Zero Shadow Day astronomical event, we don’t need any extraordinary devices—just a stick or any simple object capable of projecting the shadow.

The Public Outreach and Education Committee of the Astronomical Society of India has developed an android app, and an interactive map to locate the Zero Shadow Time in India.

Special thanks to Mr. Alok Mandavgane, who created such an excellent app and map to visualize the event so that every individual could see the Zero Shadow Day astronomical event.

Android app: ZSD 

Website: Interactive map to locate the time of Zero ShadowDay 

For example:

In the android app, you can find the details of Zero Shadow Day with time, latitude, and longitude based on your location.

Screen shot of Zero Shadow Day (ZSD) android application

On the website, you can enter the location to find the details.

Screen shot of Zero Shadow Day (ZSD) website

Randomly selected places and time of the Zero Shadow Day.

Kanyakumari, Tamil Nadu, India April 09, 2020, at 12:21 IST

August 31, 2020, at 12:20 IST

Kochi, Kerala, India April 14, 2020 at 12:25 IST

August 26, 2020 at 12:26 IST

Coimbatore, Tamil Nadu, India April 17, 2020, at 12:21 IST

August 23, 2020, at 12:25 IST

Kannur, Kerala, India April 20, 2020, at 12:27 IST

August 20, 2020, at 12:32 IST

Chennai, Tamil Nadu, India April 23, 2020, at 12:07 IST

August 17, 2020, at 12:13 IST

Bangalore, Karnataka, India April 23, 2020, at 12:17 IST

August 17, 2020, at 12:24 IST

Nellore, Andhra Pradesh, India April 28, 2020, at 12:07 IST

August 12, 2020, at 12:15 IST

Hyderabad, Telangana, India May 08, 2020, at 12:12 IST

August 02, 2020, at 12:22 IST

Bhopal, Madhya Pradesh, India June 12, 2020, at 12:20 IST

August 02, 2020, at 12:24 IST

 Please use the android app or website to know the Zero Shadow Day details of your place.

Enjoy Zero Shadow Day (Astronomical event).


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