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While the fleeting beauty of a rainbow often graces our skies for mere minutes, a truly extraordinary atmospheric phenomenon unfolded over the mountains of Yangmingshan in Taipei, Taiwan, on November 30, 2017. What began as a typical post-rain spectacle evolved into a record-breaking display, captivating observers for an astounding eight hours and fifty-eight minutes. This remarkable event, documented meticulously by professors and students from Chinese Culture University, shattered the previous world record of six hours held by a rainbow sighted in Yorkshire, England, in 1994.
The longevity of this Taiwanese rainbow was not merely a stroke of luck but a convergence of specific meteorological and geographical factors. The region's moderate seasonal winds and hilly terrain, particularly the Yangmingshan mountain range where the university is situated, played a crucial role. These conditions effectively trapped moist air, leading to a continuous formation of clouds and a steady drizzle. Coupled with the precise angle of the sun in the late November sky, which remained below 42 degrees above the horizon, the constant replenishment of water droplets illuminated by the sun's rays allowed the vibrant arc to persist for an unprecedented duration.
Witnessing such a prolonged rainbow is incredibly rare, as most typically last less than an hour. The consistent stream of water droplets, combined with the stable vantage point from the elevated university campus, provided the ideal conditions for this natural wonder to unfold. Professors Chou Kun-hsuan and Liu Ching-huang, from the university's Department of Atmospheric Sciences, recognized the unique opportunity and mobilized students to collect thousands of photographs, creating a "rainbow clock" with time-coded images to officially verify the record with Guinness World Records. This diligent documentation ensured that the world could appreciate the science behind this breathtaking and enduring "gift from the sky."