The phrase "path of totality" gets used a lot around eclipses, and it hides the single most important decision an eclipse traveller makes: where to stand. Being just outside the path is not "almost as good" — it is a completely different, and far lesser, event.

Two shadows, not one

The Moon casts two nested shadows. The faint outer shadow, the penumbra, is enormous and covers a large fraction of a continent; anyone inside it sees a partial eclipse, where the Moon takes a bite out of the Sun but the sky stays bright. The dark inner shadow, the umbra, is small — typically a couple of hundred kilometres across — and only where the umbra sweeps across the surface do you get totality, the brief period when the Moon completely covers the Sun's disk.

The track the umbra traces across the Earth is the path of totality. It is long (it can stretch across whole continents) but narrow. Stand inside it and the Sun disappears; stand 30 km outside it and the Sun never fully goes.

Why 99% is not 90% of the experience

It is tempting to think a 99% partial eclipse must be 99% as good. It is not even close. That last 1% of the Sun's disk is still thousands of times brighter than the full corona, so at 99% the sky stays blue-ish, the corona stays invisible, the stars stay hidden and you must keep your eclipse glasses on the whole time.

Only when the disk is 100% covered does the extraordinary part happen: the sky darkens to deep twilight, the Sun's pearly corona blazes into view, bright planets and stars appear, the temperature drops, birds fall quiet, and — for that window only — it is safe to look with the naked eye. There is a genuine all-or-nothing cliff at 100%. This is why eclipse chasers travel across the world to move a few dozen kilometres onto the centre line.

How wide, how fast

The umbra races along the path at more than 2,000 km/h, which is why totality at any one spot is measured in minutes, not hours. The width of the path depends on the eclipse geometry — how close the Moon is, and the angle of the shadow — but is often in the range of 150–270 km. The closer you are to the centre line of the path, the longer totality lasts; near the edges it can shrink to a few seconds, so aiming for the middle buys you margin.

How to know if you are in the path

For any given eclipse, detailed maps published by bodies such as NASA and by eclipse cartographers show the northern and southern limits of the path and the centre line. The practical rules:

  • Confirm your spot is inside both limits, not just near them. Maps are precise; "roughly in the area" is not good enough near the edge.
  • Aim for the centre line where you can, for the longest totality.
  • Have a weather backup. The path is fixed but the clouds are not; a spot with a clear sky beats a longer-totality spot under cloud every time.

The 2026 path across Spain

On 12 August 2026, the umbra crosses northern Spain from the Galician coast in the west to the Balearics in the east, passing over or near cities including A Coruña, Oviedo, León, Bilbao, Zaragoza, Valencia and Palma de Mallorca. Madrid, Barcelona, Seville and most of southern Spain lie outside the path and see only a (deep) partial eclipse.

One quirk of this eclipse is that the Sun is very low in the west at totality — only a handful of degrees above the horizon — so an unobstructed western view matters more than usual. Check whether your destination is in the path, and see the exact local times and Sun altitude, on our eclipse city pages. For how the light and landscape change across the event, see eclipse day, minute by minute.