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Zero Shadow Day calendar for Entire Karnataka 2022

In the coming days, as the Sun makes its way across the sky, moving towards the north with each passing day, depending upon where you live, the Sun will pass through the Zenith. This is Zero Shadow Day. Zenith is the point exactly above your head wherever you stand. Given the earth is a sphere-globe, this point varies from place to place with respect to the sky.

At any other point, with the Sun facing you at an angle, your shadow will be cast on the ground around you. As the sun reaches higher in the sky, the length of the shadow reduces and, on this day, when the sun is exactly above your head, it casts a shadow exactly below you. Since you stand on this shadow, you don’t really see your shadow making your shadow invisible… or Zero shadow.

With the Earth tilted at an angle of 23.5 degrees (as the globes are made), as the earth moves around the Sun, the sun appears to move from north to south, appearing at zenith on two days of the year for all people living between the Tropic of Cancer and Tropic of Capricorn. The two days occur in April-May and August every year, with August being the monsoon and April, a summer month, the chances of observing Zero Shadow Days are higher during this time.

This is one of the easiest astronomical phenomena that can be observed without the use of any instrument.

People at Mangaluru will observe Zero Shadows at 12:28pm on 24th of April and at Udupi on 25th April at 12:29pm. People in Bengaluru will have their Zero Shadow moment on the 24th of April at 12:18pm. 

The following are the dates of Zero Shadow day for the rest of Karnataka:

22 Apr : Mysore, Madikeri

23 Apr : Mandya, Putt0ur

24 Apr : Mangalore (D.K.), Hassan, Bengaluru 

25 Apr : Udupi, Chikamagaluru, Tumkur, Chikkaballapura

26 Apr : Kundapura, Thirthahalli, Gauribidanur

27 Apr : Bhatkal, Shivamogga, Channagiri

28 Apr : Honnavara, Kumta, Shikaripura, Chitradurga

29 Apr : Gokarna, Sirsi, Ranebennur, Davanagere

30 Apr : Karwar, Haveri 01 May : Hubli, Hospet, Bellari

02 May : Dharwad, Gadag, Koppala 

03 May : Belagavi, Sindhanur

04 May : Gokak, Bagalkot, Raichur

06 May : Yadgir

07 May : Vijayapura

09 May : Kalburgi

10 May : Hunmabad

11 May : Bidar

The shadows for the above place will disappear for a minute between 12:15pm for eastern and 12:35pm for western parts of the state. 

In order to observe Zero Shadow, an object needs to have an equal or increasing width from top to bottom, like a Cylinder, Cube or a Cone. Poles, Traffic Cones or an Inverted Glass Tumbler. Humans have a broader upper body than our lower half and hence would cast a very small amount of shadow which will be minimum on Zero Shadow Day. 

Poornaprajna Amateur Astronomers’ Club urges people to observe and enjoy this beautiful astronomical phenomenon and we wish clear skies to all those who set out to see their shadows disappear.

- Atul Bhat

  Co-ordinator, Poornaprajna Amateur Astronomers' Club, Udupi

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