What the path data represents
NASA publishes WGS84 northern and southern umbral limits every 120 seconds. This site interpolates those limits for nearest-path distances and calculates each city independently from the Besselian elements.
Published cities inside totality
These locations calculate totality above the geometric horizon using the same validated city-record pipeline.
Outside the path
A city outside the boundary sees a partial eclipse if the event is above its horizon. The nearest-boundary distance is geometric planning data, not a route or travel recommendation.
Primary sources
Read the astronomical references that support this summary.