Skywatchers from West Africa to the Arabian Peninsula, India, and southern China are gearing up for a spectacular annular solar eclipse on Sunday, June 21, 2020, dubbed the “ring of fire” for its striking halo effect.
Coinciding with the northern hemisphere’s summer solstice—the longest day of the year—this celestial event is the most dramatic of its kind in years, visible only along a narrow path covering about 2% of Earth’s surface.
A Celestial Spectacle
An annular eclipse occurs when the moon passes between Earth and the sun but is too far from our planet to fully obscure the sun’s light, leaving a glowing ring around the moon’s silhouette.
The eclipse will first appear minutes after sunrise in northeastern Congo-Brazzaville, where it will last 1 minute and 22 seconds, the longest duration.
It will reach its “maximum eclipse”—a perfect solar halo—over Uttarakhand, India, near the Chinese border, just after midday, lasting 38 seconds.
“It’s a bit like switching from a 500-watt to a 30-watt light bulb,” said Florent Delefie, an astronomer at the Paris Observatory, describing the eclipse’s effect on daylight.
While the full “ring of fire” is visible only along the centerline across 14 countries, partial darkening will be seen hundreds of kilometers on either side.
Viewing Conditions and Safety
“Good weather is the key to successful eclipse viewing,” said astrophysicist Fred Espenak on NASA’s Eclipse website, noting that clear skies are essential for the best experience.
However, Delefie warned that looking at the sun during an eclipse, even when partially obscured, is dangerous.
“The sun is so bright that even when there’s only a tiny portion visible, it is still dangerous for the eyes,” he said. Proper eye protection, such as certified eclipse glasses, is essential, and sunglasses are not safe for viewing.
A Year of Eclipses
This annular eclipse is the first of two solar eclipses in 2020. The second, a total solar eclipse on December 14, will cross South America, where the moon, closer to Earth, will completely block the sun’s light for about two minutes. The event will take less than 100 minutes to traverse the continent.
As skywatchers prepare for Sunday’s event, experts urge caution and proper preparation to safely enjoy this rare celestial phenomenon.
