National Football League · 20022025 · 32-Team Era
Near Miami, Indiana
Epicenter map
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Selected-range context
What shaped this epicenter
Established range
Detailed historical data
Epicenter trail detailsHow the point moved as each season joined the selected range
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Champions in this rangeSeason, program, historical home location, and recognition basis
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Transparent by design
How Champography calculates the point
Published dataset 2.2 · wgs84-frechet-v1
Every coordinate shown above is calculated offline, validated, and published in a content-hashed static artifact. The browser reads stored results; it does not approximate historical epicenters while you move the slider.
The epicenter
The equal-season-weight geodesic Frechet mean of the selected champion season points, computed on the WGS84 ellipsoid. Each point is the champion's verified home stadium for the season they won: the NFL/APFA champion for 1920-1965 and the Super Bowl winner from 1966 onward.
Season weighting
Every championship season contributes a total weight of exactly 1.0. The NFL has one champion per season, so no season splits its vote.
The AFL
Not applicable to the counted NFL record: every season 1920-present has a single league champion. AFL championships (1960-1969) are preserved as recorded, non-counted claims rather than split titles, so the 1968 Jets and 1969 Chiefs - AFL champions who also won the Super Bowl - are never double-counted.
Historical stadiums
The champion's regular-season home stadium is used, never the Super Bowl host site or a title-game venue. Season-specific stadium chronology is applied throughout (the 2006 Colts point is the RCA Dome, not Lucas Oil Stadium; the 1971 Cowboys point is Texas Stadium, which opened that October). Defunct 1920s grounds carry documented historical-site coordinates with explicit lower precision in the public CSV.
The champion policy
For 1966-present the Super Bowl winner counts; for 1933-1965 the NFL Championship Game winner; for 1920-1932 the champion by league standings. AFL champions are recorded but excluded from the default epicenter; pre-1920 professional football is excluded entirely because no formal league awarded champions.
Place labels
A point inside a municipality is labelled with that municipality, decided by point-in-polygon against Census place boundaries rather than by proximity. GNIS stores a city as a single downtown point, so nearest-point resolution inside a large city found whichever neighbourhood, park or subdivision happened to sit closest, and a point in Lexington resolved to Hollywood, Kentucky. Where boundaries overlap the smallest containing place wins, as the most specific true answer. Outside every boundary the label names the nearest populated place in the official USGS GNIS extract, which includes small and unincorporated communities. GNIS also classes apartment blocks, public-housing projects and neighbourhood tracts as populated places, so where the nearest name is one the Census Bureau does not list, a Census-recognized place in the same state is preferred when it lies within twice the distance or three kilometres further; rural communities the Census Bureau also omits keep their own name rather than being replaced by a larger town miles away. Places GNIS marks as no longer existing are not published while any extant place lies within fifteen miles. GNIS covers the United States only, so a source-controlled Canadian table of 418 populated places supplies Canadian labels, compiled rather than read from an authoritative extract and accurate to about a kilometre. A county is stated only when the nearest place is within 15 km, since the county belongs to the place rather than to the point, and beyond 25 miles a label gives distance and bearing instead of saying 'near'. Boundary geometry is simplified to roughly 220 m, far below the size of any municipality.
Current verified coverage: Champion coverage spans the APFA/NFL founding in 1920 through the latest completed season. AFL champions 1960-1969 are recorded as a separate non-counted layer. Defunct-franchise grounds from the 1920s use documented historical-site coordinates flagged with lower precision in the public CSV.
Complete methodologyWeighting, venue policy, locality resolution, precomputation, QA, and limitations.How the math worksWGS84 geodesic mean, range lookup, and trails.Championship erasWhy each preset begins and ends where it does.Search the champions recordInspect every claim, stadium, recognition basis, and source — including the AFL layer.