The unusually big and bright moon happens when the Earth's satellite rock is full at the same time as, or very near, perigee -- its closest point to our planet on its monthly ellipsis-shaped orbit.
At a distance of 356,509 kilometres (221,524 miles), this is the closest it has been to Earth since 1948, creating what NASA described as "an extra-supermoon".
The phenomenon was visible first in Asia, sending astronomy enthusiasts and photographers flocking to the best viewing spots, hoping the chronic pollution that blights many of the region's cities would not spoil the fun.
Loud cheers went up among the crowd as the moon made brief appearances between heavy, grey clouds before disappearing.
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"It's really nice," Aidan Millar-Powell told AFP of the festive community atmosphere at the beach. "People don't usually come together like this in Sydney for a natural phenomenon."
Tourists, office workers and couples crowded the Hong Kong waterfront as the supersised moon rose over the skyscrapers of the financial hub, while in the Chinese capital Beijing the moon climbed spectacularly over the city's skyline.
In Thailand, astrologers were variously predicting the supermoon would bring disaster or great fortune.
The supermoon means a stronger high tide, something that gets surfers giddy with excitement, not only at the prospect of riding bigger waves, but doing so at night.
Astronomers say it can be hard to notice that the moon appears brighter than usual. Once it is high in the sky, it can also be hard to tell it is larger.
Supermoons are actually quite common -- there is one every 14 months on average.
"But some supermoons are more super than others," said Descamps.
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