About Zero Shadow Day
Zero Shadow is a phenomenon when the sun is exactly overhead and the shadows of symmetrical and vertical objects vanishes. This happens for locations between the tropics and is caused by the northern and southern motion...
Zero Shadow is a phenomenon when the sun is exactly overhead and the shadows of symmetrical and vertical objects vanishes. This happens for locations between the tropics and is caused by the northern and southern motion of the sun during the course of a year. This app helps you find the Zero Shadow Day for any location.
If you are between Tropic of Cancer and Tropic of Capricorn, then on a particular day (one during Uttarayan and other during Dakshinayan) the Sun will pass directly overhead at local noon. At local noon on this day, a vertical pole will cast no shadow. These are called Zero Shadow Days, or ZSD. This app is an aid to the campaign by the Public Outreach and Education Committee of the Astronomical Society of India for celebrating ZSD.
Inputs and Content by
Dr. Niruj Mohan Ramanujam, ASI POEC
Translations by:
Kannada - Dr B.S. Shylaja of Jawaharlal Nehru Planetarium Bengaluru and Mrs. Jyotsna
Telugu - Teja Teppala
Marathi - Dr. Aniket Sule, HBCSE, ASI POEC.
Hindi - Alok Mandavgane
Spanish - Alvaro Jose Cano Mejia from Colombia
Portuguese Brazilian - José Roberto Vasconcelos Costa
Previous Versions
Here you can find the changelog of Zero Shadow Day since it was posted on our website on 2021-12-14 21:58:02.
The latest version is 3.2.5 and it was updated on 2026-06-17 23:37:59. See below the changes in each version.
Zero Shadow Day version 3.2.5
Updated At: 2025-10-18
Changes: Bug fix for ZSD Finder crash.
Added missing translations
Zero Shadow Day version 3.2.3
Updated At: 2025-07-20
Changes: attempt to fix crashes on several devices
fix for location bug. location set to 0,0 if not set
Zero Shadow Day version 3.2
Updated At: 2025-06-22
Changes: Update to 3.2
Support for larger devices and landscape mode.
Interactive scroll on date added.
Zero Shadow Day version 2.4
Updated At: 2024-04-23
Changes: Fix for zsd info not showing.
Now you can calculate distance between two places by long pressing on other location. The shortest distance from the chosen location will be shown in the zsd info page
Zero Shadow Day version 2.3
Updated At: 2024-03-30
Changes: Gnomon and shadow added back in Visualization
UI Changes, colours are now uniform in UI
Zero Shadow Day version 2.2
Updated At: 2023-08-20
Changes: Bug fixes, and UI enhancements
Zero Shadow Day version 2.0
Updated At: 2022-10-19
Changes: Upgrade to Material You Theme
Haptics added for slider change
Day night shown in 3d visualization
Zero Shadow Day version 1.6.4
Updated At: 2020-04-22
Changes: Fix for one day shift error in dates.
Disclaimer
Official Google Play Link
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