FA-93634 / Solar tracker geometry / Member archive

Cross-axis slope aware backtracking: correction angle units · case 04

Backtracking barely changes the angle and rows keep shading each other.

Member previewVariant 4 · 3 implementations · 7 checks per implementation

Case contract

Rows on terrain with cross-axis slope cross_tilt degrees. dist = 1/(gcr*cos(cross_tilt)); temp = dist*cos(ideal - cross_tilt). When temp < 1 the angle becomes ideal - sign(ideal)*acos(max(temp, -1)) degrees, else ideal. The result is then clamped to +-max_angle. Return the angle rounded to 3.

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
normal: flat terrain matches plain backtracking	`-60`	`-38.765`	Failed

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This record includes three runnable implementations, regression fixtures, execution results, and source hashes.

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