Millions Crowd Cities to See Spain's First Total Solar Eclipse in Over a Century As millions flock to cities across Spain to witness the country's first total solar eclipse in over a century, many are left curious about the science behind this rare phenomenon.
A total solar eclipse occurs when the moon passes directly between the Earth and the sun, blocking the sun's light completely in a specific region.
This alignment is rare because the moon's shadow has a relatively narrow path on the Earth's surface, typically around 100 miles wide.