An astronomical phenomenon of Zero Shadow Day 2019 is marked on April 24. This occurs twice a year. On this day, the sun is exactly at the top and no shadow is thrown on the ground.
The Sun crossed the local meridian connecting from the north to the south. The sun will exactly reach its zenith at 12.18pm. At this point, the person’s shadow is exactly under the person so one cannot see it. Special programmes are arranged in planetarium and observatories to learn more about the phenomenon.
What is Zero Shadow Day?
When the sun is directly overhead on a specific latitude, it is referred to as Zero Shadow Day. The sun is said to be at the highest point in the sky and the sun rays hit the surface but at a perpendicular angle to the surface. So at a specific point, one cannot observe the shadow of anything around. To see the shadow one has to jump and see it. on every location of the planet between the Tropic of Cancer and Tropic of Capricorn, the Zero Shadow Day is witnessed twice a year. In India, it will happen between April and September. As we move away from this day, a vertical pole will cast almost no shadow and will last longer and longer shadow at a special day.
Zero Shadow Day 2019
The day will be witnessed on April 24 at 12.18 pm. To witness it, you need to go and stand in the sun from the exact afternoon. The time will differ for people located at different longitudes. This Zero Shadow Day will be different for different places (different latitudes).
To learn more about this phenomenon in a different set of programmes will be held in Bengaluru and Chennai and students will be learning more about the phenomenon. At Tamil Nadu Science and Technology Centre (TNSTC), a group of 60 students will learn to measure the longest and shortest shadow time. Meanwhile, the Jawaharlal Nehru Planetarium in Bengaluru will have a one-day workshop for students above the 8th grade.
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