(CNN) — The longest solar eclipse of the century cast a wide shadow for several minutes over Asia and the Pacific Ocean Wednesday, luring throngs of people outside to watch the celestial spectacle.

A woman looks through a refractor telescope with a solar filter on top of the roof of a school in Hong Kong.

Day turned into night. Temperatures turned cooler in cities and villages teeming with amateur stargazers.

The total eclipse could be seen starting in India on Wednesday morning and moving eastward across Nepal, Bangladesh, Bhutan, Vietnam, China and parts of the Pacific. Millions cast their eyes towards the heavens to catch a rare view of the sun’s corona.

Cloud cover in some areas prevented people from fully savoring the phenomenon. Still, many were awed.

Tim O’Rourke, a 45-year-old freelance photographer from Detroit, Michigan, lives in Hong Kong but traveled up to Shanghai — touted as one of the best spots to watch the eclipse.

“It was pitch black like midnight,” said O’Rourke, standing in People’s Square with what appeared to be a crowd of thousands.

“Definitely not disappointed we came. Of course it would have been much better with nice weather, blue skies. But still it was a great experience, it was a lot of fun.” he said.

Total eclipses occur about twice a year as the moon passes between the Earth and the sun on the same plane as Earth’s orbit. Wednesday’s event lasted up to more than six minutes in some places. 

In India, where an eclipse pits science against superstition, thousands took a dip in the Ganges River in the Hindu holy city of Varanasi to cleanse their souls, said Ajay Kumar Upadhyay, the district’s most senior official.