FA-93548 / Solar tracker geometry / Member archive

Tracker row-to-row shaded fraction: relative sun angle · case 03

Rows facing the morning sun report heavy shading while rows facing away report none.

Member previewVariant 3 · 3 implementations · 7 checks per implementation

Case contract

rot is the row rotation and proj the sun zenith projected on the plane perpendicular to the axis, both signed degrees. |proj| >= 90 or cos(rot - proj) <= 0 means no direct light: [1.0, True]. Otherwise shaded fraction = clip(1 - cos(proj)/(gcr*cos(rot - proj)), 0, 1). Return [fraction rounded 4, fraction > 0].

Why this case matters

Single-axis and dual-axis solar trackers turn a sun direction into actuator commands; a sign, frame or limit mistake points a whole plant away from the sun or into a mechanical stop.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
boundary: steep morning sun	`[1.0, true]`	`[0.3054, true]`	Failed

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