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Today 18th Aug 2023, it's second time when Bengaluru encountered Zero Shadow Day after April 25.
Bengaluru is set to become the stage for a breathtaking phenomenon known as Zero Shadow Day, marking the second occurrence of this celestial marvel in 2023. As we delve into the intricacies of this enchanting event, we uncover the scientific intricacies that give rise to this phenomenon, capturing a moment when the sun’s position in the sky aligns perfectly, resulting in a peculiar absence of shadows. Let’s embark on a journey to understand the captivating magic behind Zero Shadow Day.
The dance of shadows and sunlight
Zero shadow day defined
Zero Shadow Day is a rare spectacle that graces certain locations between the Tropic of Cancer and the Tropic of Capricorn, where the Earth’s rotation axis is inclined at an angle of 23.5 degrees. This unique celestial event occurs twice a year, giving rise to a fleeting moment of optical wonder when objects cast no shadows on the ground. This intriguing occurrence finds its stage in the city of Bengaluru, where, at the precise time of 12:24 pm, the sun’s rays align perfectly overhead, resulting in the apparent vanishing of shadows.
The Sun’s celestial journey
The key to comprehending Zero Shadow Day lies in the Earth’s axial tilt and its elliptical orbit around the sun. As the Earth spins on its axis, this axial tilt of 23.5 degrees introduces a mesmerizing play of shadows and sunlight. This tilt causes the sun’s path across the sky to vary over the course of a year, creating the conditions for the occurrence of Zero Shadow Day.
Unveiling the scientific marvel
Zero shadow day explained
The Astronomical Society of India offers a comprehensive explanation of this phenomenon. Although the sun is not precisely overhead at noon due to Earth’s axial tilt, during Zero Shadow Day, it reaches the zenith directly above certain latitudes. For places residing between +23.5 and -23.5 degrees latitude, the sun’s declination perfectly matches their latitude twice a year, during the Uttarayan and Dakshinayan phases. This alignment causes the sun to cast no shadow at solar noon on these specific dates.
A yearning for zenith
Imagine the celestial dome, where the zenith stands as its pinnacle. Zero Shadow Day occurs when the sun’s journey through the sky places it precisely at the zenith. This alignment ensures that an individual’s shadow coincides perfectly beneath them, resulting in the mesmerizing absence of shadows. This phenomenon occurs only twice a year, making it a moment of celestial rarity.
Bengaluru’s rendezvous with the Sun
The countdown to zero shadow day
As Bengaluru gears up for its rendezvous with this celestial phenomenon, the anticipation builds. On August 18, 2023, precisely at 12:24 pm, the sun will assume its zenith position over the city. During this fleeting moment, vertical objects like poles and sticks will defy the norm, casting no shadows. The science behind this spectacle becomes a living reality as the shadows vanish into the ether.
Witnessing the enigma
As the clock inches closer to the anticipated time, the dance of shadows commences. Observers will marvel as their own shadows gradually fade, and objects nearby cast no shadows, appearing suspended in space. Curious observers can place various objects in the sun’s path, noting the diminishing length of their shadows as the moment of Zero Shadow approaches. At 12:24 pm, the culmination of this magic manifests as shadows entirely dissipate, leaving the landscape bathed in an ethereal glow.
The marvel of Zero Shadow Day beckons, offering us a rare glimpse into the intricate dance between the Earth, its axial tilt, and the radiant sun. As Bengaluru readies itself for this second astronomical spectacle of 2023, we find ourselves drawn into the beauty of scientific wonder. This celestial event serves as a reminder of the harmonious interplay of nature’s forces, inviting us to marvel at the world beyond our immediate perception. So, on August 18, let us collectively gaze upwards, acknowledging the magic that envelopes us during the fleeting moments of Zero Shadow Day.