"It was amazing... It felt like a gift from the sky... It's so rare!" Chou Kun-hsuan, a professor at the Chinese Culture University's Department of Atmospheric Sciences, told CNN.
Chou and a second professor, Liu Ching-huang, led the efforts to document the rainbow with the help of the department's students and the campus community.
Their observations, pictures and video recordings showed the rainbow lasted from 6.57 a.m. until 3.55 p.m. -- eight hours and 58 minutes.
If confirmed, it would shatter the previous record for the longest-lasting rainbow, set in Yorkshire, England, on March 14, 1994, which was recorded as lasting six hours, according to the Guinness World Records.
Rainbows typically last much less than an hour, according to the Guinness website.
"With the 10,000 pictures we took in our department alone, and the many more taken by others on campus and people living nearby, I'm confident we can prove to Guinness second by second that this rainbow lasted for nine hours," Chou told the BBC.
The conditions that made the rainbow last so long were a seasonal north-east monsoon that trapped moisture in the air, forming clouds; sunlight and a relatively slow wind speed of 2.5-5 metres per second.
Such atmospheric conditions are common in winter in Taipei's Yangmingshan mountain range, where the campus is located, making it an ideal place for spotting long-lasting rainbows, Chou said.
(This story has not been edited by Social News XYZ staff and is auto-generated from a syndicated feed.)
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