It felt like a gift from the sky.
The rainbow was recorded on November 30 by Chou Kun-hsuan (周昆炫) and Liu Ching-huang (劉清煌), both professors in the Department of Atmospheric Science, as they stood on the roof of the Dayi Building on the campus of CCU.
The professors are in the university's department of atmospheric sciences and enlisted the help of students and the campus community in their task, the BBC reported.
Their observations, pictures and video recordings showed the rainbow lasted from 6:57 am until 3:55 pm - eight hours and 58 minutes.
The rainbow was recorded by two scientists at Chinese Culture University in Taipei. The previous 6-hour natural phenomenon recorded March 14, 1994 in Yorkshire in England and made it into the Guinness Book of records.
Chou said after witnessing the rainbow for six hours, he was prepared for the next one.
The world may have a new record for the longest-lasting rainbow after two professors saw the phenomenon occur for almost nine hours in Taiwan.
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Professor Chou has added that he plans to soon submit evidence to Guinness to make this Taiwan rainbow officially number one. On Monday Nov. 27, the professors had a preview of what was to come when they recorded a rainbow that lasted six hours.
Students posted pictures of the rainbow from various angles and timings on the university's Facebook page.
"We need "per second" photos to support this record, no matter how many of them are available", the school explained in an online statement.
Those at the university originally didn't expect the rainbow to last long, as most rainbows don't, but after four hours the professors started asking students and others at the school to start documenting it, Professor Chou told BBC.
But a seasonal northeast monsoon in the area trapped moisture in the air, forming clouds, sunlight and a relatively slow and steady wind speed of 5.5 to 11 miles per hour, to create the flawless atmospheric conditions to extend the the length and appearance of this particular rainbow, BBC News reports.
"I plan to contact the Taipei City tourism department to promote this, 'You can see a nine-hour rainbow in Taipei in the winter, it's incredible!"