NASA’s Astronomy Picture of the Day Features Zaragoza Photo of Aug. 12 Total Solar Eclipse

NASA’s Astronomy Picture of the Day for Aug. 13 spotlights a photograph taken in Zaragoza, Spain, during the total solar eclipse that crossed parts of the country a day earlier, turning a fleeting astronomical event into a striking urban scene. The image, credited to Ruiyu Zhang, captures the Aug. 12 eclipse over one of Zaragoza’s best-known landmarks and emphasizes how brief totality was for people watching from the ground.

The eclipse swept across parts of the Northern Hemisphere on Aug. 12, passing over Greenland, Iceland, the North Atlantic, northern Spain and a small corner of Portugal, according to NASA Science. In Spain, the path of totality crossed parts of the north and center of the country. NASA listed León, Valencia and Zaragoza among the cities inside that central path, while Madrid and Barcelona were outside it.

In its caption, NASA’s APOD said the image “features two total solar eclipses viewed from Zaragoza, Spain — one over the Cathedral-Basilica of Our Lady of the Pillar and the other reflecting in the Ebro River.” The composition ties the eclipse to the city’s skyline, with the darkened sun appearing above the Cathedral-Basilica and mirrored below in the river, a reminder that the spectacle was both celestial event and local moment.

For Zaragoza, NASA listed the partial phase beginning at 7:34 p.m. CEST, with totality starting at 8:29 p.m. and ending at 8:30 p.m. The partial phase ended at 9:07 p.m. In other words, the fully eclipsed sun lasted only about a minute there, at roughly 18:29 UTC. More broadly, NASA said, “For most in the path of totality, the Sun will be fully eclipsed for less than two minutes.”

That brevity is part of what made the eclipse so notable. Total solar eclipses are rare at any given location, and this one crossed mainland Iberia for the first time in more than a century. The historical benchmark most often cited in Spain is 1912, the last time a total solar eclipse crossed the Iberian Peninsula. Spain’s Canary Islands, which lie off northwest Africa but are part of the country, last saw a total eclipse in 1959.

APOD often highlights visually dramatic images from around the world, but this one also documents a specifically time-sensitive event: a narrow path of shadow moving across northern Spain, with darkness lasting barely long enough to register before sunlight returned. In Zaragoza, the moment over the Cathedral-Basilica of Our Lady of the Pillar and the Ebro River was measured in seconds, even if the photograph will last much longer.