In Bengaluru, often referred to as the Silicon Valley of India due to its bustling IT sector, the stage is set for another occurrence of the captivating celestial event known as 'Zero Shadow Day,' marking its second appearance this year.
This phenomenon unfolds when the sun takes its place directly overhead, casting no trace of a shadow upon the earth's surface. Today, on August 18, at precisely 12:24 pm, the residents of the city will be granted the chance to witness the enchanting vanishing act of shadows during this extraordinary celestial spectacle.
Bengaluru encountered its preceding Zero Shadow Day on April 25, an event that never fails to trigger a surge of social media posts dedicated to this wondrous cosmic occurrence.
In the lead-up to this imminent celestial event, numerous posts and videos are already circulating, igniting a sense of anticipation and enthusiasm among the populace.
What is Zero Shadow Day?
Zero Shadow Day, also recognized as No Shadow Day, is a remarkable astronomical phenomenon manifested in specific geographic areas on Earth where the Sun assumes a directly overhead position precisely at solar noon. This intriguing phenomenon is a direct consequence of the Earth's axial tilt, which is approximately 23.5 degrees, and its orbital trajectory around the Sun.
Between the Tropic of Cancer (located approximately 23.5 degrees north of the equator) and the Tropic of Capricorn (situated about 23.5 degrees south of the equator), instances arise when the Sun's position aligns perfectly overhead during local solar noon. This alignment results in vertical objects, such as poles or rods, casting minimal to no shadow, as the Sun's rays descend almost vertically.
When does Zero Shadow Day occur?
As outlined by the Astronomical Society of India (ASI), Zero Shadow Day typically unfolds twice a year within these tropical regions, coinciding with the moments when the Sun traverses the zenith point. The specific dates of this phenomenon can vary based on the particular location and its latitude. Beyond its mesmerizing allure, this event holds cultural and educational significance, often celebrated as a distinctive astronomical occurrence. It serves as a valuable opportunity to educate individuals about the Earth's axial tilt, its orbital course around the Sun, and the ever-changing angles of sunlight throughout the annual cycle.
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