What the Totality Finder actually finds
The tool first checks your starting coordinate with the local eclipse engine. If the point is partial, it identifies nearby NASA-derived centerline segments and tests coordinates along those routes until the eclipse changes to total. That produces a modelled totality boundary estimate.
Why the tool also gives a 5 km inside-path point
The mathematical edge is a poor observing target. NASA notes that lunar mountains and valleys can shift predicted eclipse limits by kilometres. A tiny position error can also change a barely-total point into a partial-eclipse point. Eclipse Wayfinder therefore separates the boundary estimate from a buffered planning point.
“Nearest” does not mean nearest by road
The distance is great-circle distance over the Earth's surface. It does not know about highways, mountains, ferries, borders, private land or restricted areas. Use it to answer “how close is totality geometrically?” Then plan the real route with current mapping and travel information.
When this tool is most useful
- Seville visitors checking how far they must move to cross into totality.
- Cairo-based travellers separating a deep partial eclipse from the actual total path.
- Observers near a path edge who want an inside-path buffer rather than a risky boundary point.
- Researchers comparing how quickly totality access changes across neighboring coordinates.
What to do after you reach totality
Once your point is inside, the next question changes from “can I see totality?” to “is extra travel worth it?” Open the Totality Gain Calculator to see the seconds gained as you move deeper into the path.
Why a 99% partial eclipse is not the same as totality
Totality is a distinct phase. Outside the path, some bright photosphere remains visible and normal solar-viewing protection is still required. Inside totality, the photosphere becomes completely covered for a short interval. That is why this tool prioritizes crossing the path boundary rather than merely increasing obscuration.