Sources

Every voice keeps its trail.

Pitching knowledge travels through official records, pitchers, coaches, analysts, historians, and the community. Every claim is labeled by where it came from and how confident that source is, so those voices can share one museum without losing their context.

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.