Skywatchers along a narrow band from west Africa to the Arabian Peninsula, India and the Far East witnessed Sunday a dramatic "ring of fire" solar eclipse.
So-called annular eclipses occur when the Moon - passing between Earth and the Sun - is not quite close enough to our planet to completely obscure sunlight, leaving a thin ring of the solar disc visible.
They happen every year or two, and can only been seen from a narrow pathway across the planet.
Sunday's eclipse arrived on the northern hemisphere’s longest day of the year - the summer solstice - when Earth's north pole is tilted most directly towards the Sun.
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The "ring of fire" was first visible in northeastern Republic of Congo from 5:56am local time (2:56pm AEST) just a few minutes after sunrise.
This is the point of maximum duration, with the blackout lasting 1 minute and 22 seconds.
Arcing eastward across Africa and Asia, it reached "maximum eclipse" - with a perfect solar halo around the Moon - over Uttarakhand, India near the Sino-Indian border at 12:10pm local time (4:40 pm AEST).
More spectacular, but less long-lived: the exact alignment of the Earth, Moon and Sun was visible for only 38 seconds.
In Nairobi, east Africa, observers saw only a partial eclipse as clouds blocked the sky for several seconds at the exact moment the Moon should have almost hidden the Sun.
Despite some disappointment Susan Murbana told AFP: "It was very exciting because I think I'm so obsessed with eclipses.
"Today has been very kind to us in terms of the clouds. And we've been able to see most of it," said Murbana who set up the Travelling Telescope educational programme with her husband Chu.
Without the coronavirus pandemic, they would have organised a trip to Lake Magadi in southern Kenya where the skies are generally clearer than over the capital.
"With the pandemic situation, we're not able to have crowds... and get kids to look through or do stuff," she said but still managed to share the event on social media.
"We had around 50 people joining us via Zoom and then we have so many people via our Facebook live."
The annular eclipse is visible from about two percent of Earth's surface, Florent Delefie, an astronomer at the Paris Observatory, told AFP.
"It's a bit like switching from a 500-watt to a 30-watt light bulb," he added. "It's a cold light and you don't see as well."
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The full eclipse was visible at successive locations over a period of nearly four hours, and one of the last places to see the partially hidden Sun was Taiwan.
People hundreds of kilometres on either side of the centreline across 14 countries could also see light drain from the day but not the "ring of fire".
Weather conditions are critical for viewing.
A solar eclipse always occurs about two weeks before or after a lunar eclipse, when the Moon moves into Earth's shadow. Lunar eclipses are visible from about half of the Earth's surface.
There will be a second solar eclipse in 2020 on December 14 over South America. Because the Moon will be a bit closer to Earth, it will block out the Sun's light entirely.
