National Football League · 20022025 · 32-Team Era
Near Bennetts Switch, Indiana
Epicenter map
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Explore the historical range
Select the championship timescale
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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
Trail details appear when the sport lookup loads.
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 1.3 · 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
Labels prefer the official USGS GNIS Populated Places extract, which includes small and unincorporated communities. If the full national extract is unavailable during a build, a source-controlled GNIS seed is merged with GeoNames cities1000 and the fallback is disclosed in release metadata. GNIS covers the United States only, so a source-controlled Canadian metropolitan table supplies labels for points inside Canadian urban areas; it is a metro-level reference rather than an exhaustive gazetteer, is only consulted within 30 km, and rows resolved against it are marked in the public CSV. Labels remain qualified as 'Near' because populated-place points do not prove legal municipal containment.
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.