People gather to watch the total solar eclipse over the town of Prineville, Oregon, U.S.

(Image credit: Dimitrios Manis/SOPA Images/LightRocket via Getty Images) Getty Images)

On Aug. 12, 2026, millions of people across Spain will witness a solar eclipse. Trouble is, some will think they're seeing the main event when they're not, while others will have their view of the all-important, 100% eclipsed sun blocked by mountains or clouds.This is the first total solar eclipse visible from mainland Europe since 1999, with much of northern Spain within the path of totality. However, this eclipse happens extremely late in the day, with the eclipsed sun hanging low above the west-northwest horizon just before sunset.From Galicia and Asturias to Aragón, Valencia and the Balearic Islands, successful eclipse-chasing in Spain will depend far less on simply being within the path of totality than on precise positioning.Here are the biggest ways eclipse travelers could accidentally miss the spectacle — and how experienced eclipse chasers will plan to avoid disappointment.1. Staying outside the path of totality

A map of the path of totality on Aug. 12, 2026. (Image credit: Created and annotated by Jamie Carter using MapHub.net. Source: Esri, Maxar, GeoEye, Earthstar Geographics, CNES/Airbus DS, USDA, USGS, AeroGRID, IGN, and the GIS User Community. Eclipse path from Xavier Jubier)If you hear anyone utter the immortal phrase "90% totality" or anything similar, scream. There is no such thing as partial totality — just a partial eclipse and a total eclipse. On Aug. 12, 2026, the path of totality in Spain will be about 190 miles (305 km) wide as it strikes Galicia and, remarkably, will slip between Madrid and Barcelona, Spain's biggest cities.Observers in those two cities will see an extremely deep partial eclipse, but not totality — no view of the corona and the many other phenomena that occur only during totality. A 99% partial solar eclipse may sound dramatic, but the remaining 1% of direct sunlight is still overwhelmingly bright. For eclipse chasers, there is a simple rule: totality or bust.2. Choosing the wrong horizonThis eclipse occurs at a very low altitude in Spain. In northwestern Spain, the eclipsed sun will sit roughly 10-12-° above the horizon during totality. In eastern Spain and the Balearic Islands, it will be just 2-5° high. Along the Mediterranean coast, the irony is particularly cruel. Its resorts are designed to face east toward the sea for sunrise views, while the eclipse occurs low in the west-northwest, close to sunset. In these locations, the eclipse could happen behind buildings, trees and hills. Experienced eclipse chasers know that for this eclipse, horizon geometry matters more than almost anything else.