Sources

Sourced, not corrected.

Many ways can work. Nothing here is marked right or wrong; every claim is labeled by where it came from and how confident the source is. The reader judges. The atlas only sources.

As of . Sources last checked, not auto-refreshed.

How to read a claim

Every claim on the site wears one of seven badges, strongest to weakest. The badge is the point: official tracking context and a coaching cue from a blog can both belong here, but they do not look the same. Each claim was checked against the source it cites before it shipped; what a source could not support is shown as unverified, not hidden.

Official dataPublished by the source of record; used for biography facts, source context, and sourced prose.
Reputable analysisA credible analyst, or our paraphrase of a cited reference.
Secondhand, attributedA quote or figure relayed through a secondary source.
Pitcher's own wordsStated by the athlete directly.
Coach-observedReported firsthand by a coach.
Community, firsthandA community member's own report. Launches with safeguards.
UnverifiedNo source corroborated this value. Shown so the gap is visible.

A value marked with a leading approximate sign is rounded, era-dependent, or methodology-bound. The seam render is a seam-informed schematic, documented in docs/seam-calibration.md.

The citation registry

Original geometry, diagrams, and words. Real grip photos ship only from clean sources: our own photography, community own-grip uploads, and verified Creative Commons or public-domain images with attribution; never an unlicensed agency photo, a team or league mark, or broadcast footage. Instructional text is paraphrased and cited, never copied. No runtime API calls: every figure here is static and sourced in the repository.