The longest total solar eclipse of the remaining 21st century will turn day into night for up to 6 minutes and 23 seconds on August 2, 2027. Confirmed by the National Aeronautics and Space Administration (NASA), the United States space agency, the astronomical event will be visible primarily across the Eastern Hemisphere, with the path of totality crossing ten countries, including Spain and Egypt. The extraordinary duration of darkness will happen because the Moon will pass through perigee, the closest point to Earth in its elliptical orbit.

Stretching across a path 258 kilometers wide, the lunar shadow will cover a total surface area of 2.5 million square kilometers. Astronomers highlight the rarity of the event, which significantly surpasses the total solar eclipse seen across Mexico and North America on April 8, 2024, when maximum totality lasted 4 minutes and 28 seconds. The extended darkness in 2027 is expected to draw international scientific expeditions and thousands of skywatchers to historic cities along the centerline, particularly Luxor in Egypt.

In addition to Spain and Egypt, the central shadow will pass directly over Morocco, Algeria, Tunisia, Libya, Sudan, Saudi Arabia, Yemen, and Somalia. In the city of Luxor itself, totality will reach 6 minutes and 22 seconds, while the point of greatest eclipse just southeast of the city will register 6 minutes and 23 seconds at 10:07 UTC.

Mechanics and timing of the lunar shadow

A solar eclipse occurs when the Moon aligns directly between Earth and the Sun, casting a shadow that blocks sunlight from reaching the planet’s surface. On August 2, 2027, the Moon’s proximity to Earth will increase its apparent diameter in the sky, allowing it to cover the solar disk completely for a prolonged period. Across the globe, the entire totality phase along the shadow’s track will last more than three hours, starting in the morning in the Atlantic Ocean and moving eastward past 11:00 a.m. Brasilia time (14:00 UTC) as the event winds down over the Indian Ocean.

During the peak of the alignment, the sudden darkness will reveal the solar corona — the Sun’s outer atmosphere — to the naked eye within the totality zone. Bright stars and planets will also become visible in the daytime sky as temperatures temporarily drop along the shadow’s corridor.

Countries and cities inside the path of totality

Viewing the total phase of the eclipse requires being positioned inside the narrow 258-kilometer band crossing three continents:

• Europe: Southern Spain, including the coastal cities of Cadiz and Malaga, as well as Gibraltar.
• Africa: Morocco, Algeria, Tunisia, Libya, Egypt, Sudan, and Somalia.
• Asia: Saudi Arabia and Yemen.

Surrounding areas across wide parts of Europe, Africa, and Western Asia outside this central track will experience a partial solar eclipse, where the Moon covers only a fraction of the Sun.

Three orbital factors behind the 6-minute duration

The August 2, 2027 event owes its prolonged duration to a rare convergence of three orbital and geographical factors:

• Lunar perigee: The Moon will be near its closest approach to Earth, making its apparent size in the sky larger than average.
• Earth’s distance from the Sun: Weeks after passing aphelion — Earth’s farthest orbital point from the Sun — the solar disk will appear slightly smaller from the ground.
• Low-latitude trajectory: The shadow will travel near the equator and tropical latitudes, where Earth’s rotational speed helps extend the time the shadow stays over a single location.

This combination produces the longest totality on land for decades. For historical comparison, the longest total solar eclipse recorded in the 20th century occurred in 1955, when darkness lasted 7 minutes and 8 seconds.

Solar corona research and space weather studies

The extended window of darkness offers astrophysicists an uncommon opportunity to study the inner solar corona and space weather phenomena that affect satellites and power grids. Research teams are organizing observation posts in accessible urban centers with high probabilities of clear desert skies, led by Luxor and Cadiz. Because the shadow crosses heavily populated regions and major archaeological sites rather than open ocean, both scientific deployment and international tourism are projected to reach record levels.

Eye safety rules and travel logistics

Observing any partial phase of a solar eclipse requires strict eye protection to prevent permanent retinal damage. Viewers must use certified eclipse glasses meeting the ISO 12312-2 international safety standard or utilize telescopes and binoculars fitted with dedicated solar filters. Local authorities and astronomy organizations advise travelers to book accommodations and transport well in advance, as hotels and Nile River cruises in Egypt and southern Spain face high demand ahead of August 2027.

When the next 7-minute solar eclipse will happen

While total solar eclipses happen somewhere on Earth roughly every 18 months, any single location waits centuries on average to see one. An eclipse surpassing the 2027 duration on a historic scale is scheduled for July 16, 2186, when totality will reach 7 minutes and 29 seconds — near the theoretical maximum limit — along a path visible from parts of South America and the Atlantic Ocean.