CNN– A total solar eclipse will create a celestial spectacle in the sky for the first time in more than two years on August 12.
A total solar eclipse happens when the moon passes between the sun and Earth, casting a shadow on our planet that fully blocks the sun’s light from some areas of the world, according to NASA.
Sky-gazers in parts of Greenland, Iceland, northern Spain and northeastern Portugal will glimpse totality, when the skies go momentarily dark as the sun completely disappears.
Meanwhile, a partial eclipse, in which only some of the sun’s light is blocked from view, will be seen across parts of Europe, Africa and North America.
A total solar eclipse was visible from Mexico, the United States and Canada in April 2024, but the last one observable from mainland Europe occurred in 2006, according to the European Space Agency.
The August event is the first total solar eclipse that will be visible from Spain’s mainland since 1905 — and it’s the first of three solar eclipses the country will witness between now and 2028, according to the ESA.
“A total solar eclipse is one of those rare moments when millions of people can look up together and feel both wonder and curiosity,” Carole Mundell, the ESA’s director of science, said in a statement. “It is a shared moment that connects us to the Universe and reminds us that the desire to explore and understand is one of humanity’s greatest strengths.”
A partial solar eclipse appears in the sky over Dallas on April 8, 2024. Keegan Barber/NASA
Where can I see the eclipse?
The narrow path of totality will span 5,157 miles (8,300 kilometers), starting over the Arctic coastline at around 1 p.m. ET and then passing near the North Pole before moving over Greenland, Iceland, Portugal and northern Spain, according to EarthSky.
Eclipse watchers in Greenland should see just over two minutes of totality, while those in northern Spain may only see about 20 seconds — conditions permitting. Inclement weather is always the greatest obstacle to eclipse viewing.
The eclipse will pass over Galicia and then the Balearic Islands in Spain as sunset approaches, hastening the transition from day to night, according to the Spanish Scientific and Advisory Committee for the Trio of Eclipses.
To check when the eclipse will occur in your area, and what it will look like, check Time and Date’s website.
For those who live outside the eclipse’s path, the ESA will share a livestream of totality from Spain’s Astrophysical Observatory of Javalambre in Teruel.
When is the next solar eclipse?
The next total solar eclipse will pass over southern Spain, North Africa, Saudi Arabia and Yemen on August 2, 2027, according to NASA.
The United States won’t have an opportunity to glimpse a total solar eclipse again until March 30, 2033, and even then, the only vantage point will be in Alaska. It won’t be until August 22, 2044, that a total solar eclipse will be visible from the contiguous United States, when totality will occur over North Dakota and Montana.
The next total solar eclipse with a coast-to-coast path spanning the Lower 48 states will take place on August 12, 2045. The path of totality will arc over California, Nevada, Utah, Colorado, Kansas, Oklahoma, Arkansas, Mississippi, Alabama and Florida, with a partial eclipse visible across other states.
How do I safely view the eclipse?
It’s never safe to look directly at the sun without using specialized protection — except during totality when the sun’s light is completely blocked.
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At the first hint of reappearing sunlight, don a pair of certified eclipse glasses or use a handheld solar viewer. Alternatively, you can observe the sun with a telescope, binoculars or camera that has a special solar filter on the front, which provides the same eye protection as eclipse glasses.
People look up to watch a partial solar eclipse in Chicago on April 8, 2024. Brian Cassella/Chicago Tribune/Tribune News Service/Getty Images
Sunglasses won’t work in place of eclipse glasses or solar viewers, which are thousands of times darker and held to an international standard. Avoid using torn, scratched or damaged eclipse glasses or solar viewers.
It’s also not safe to look at the sun through any optical device — cameras lens, telescope, binoculars — while also wearing eclipse glasses or using a handheld solar viewer, according to NASA. Solar rays get concentrated as they pass through an optical device, and this concentration can result in them burning through the filter on your glasses or viewer and causing severe eye damage.
What scientists can learn from eclipses
Researchers watch the total solar eclipse in Mexico on April 8, 2026. Cesar Rodriguez for The Washington Post/Getty Images
Solar eclipses present scientists with unique opportunities to study the sun and its corona, or outer atmosphere, and invite the public to participate as citizen scientists.
From left: the scene of the total eclipse at 3:03 pm, 3:04pm, and 306pm.Kimberly Rosvall/Indiana University
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During the August eclipse, scientists plan to launch high-altitude balloons that can capture images of the event and the lunar shadow. Their goal is to reproduce a 1919 eclipse experiment that measured how the sun’s gravity bends the light from distant stars and confirmed Albert Einstein’s theory of general relativity, according to the Spanish Scientific and Advisory Committee for the Trio of Eclipses.
Citizen scientists are invited to build their own instrument to measure changes that occur in the atmosphere when the sky momentarily darkens.
“We use moments like this to bring space science and technology closer to society, to inspire future generations and bring people across Europe together through the excitement of discovery,” the ESA’s Mundell said.
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