In the previous "final arc" lesson, we showed an angular measurement (165° from horizontal to full layback). The caution here is to understand the possible importance of accurate measurement ...but the likelihood of misinterpretation. Here's what we mean...
All 4 of these images show different angles. Yet they are all from the exact same instant
in the delivery of the same pitch by the same pitcher (as recorded using conventional motion capture technology
It's all in the viewpoint.
The animation below gives an even clearer view of the problem, from 360°.
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Angles at max layback... Login to see it In-Motion