FA-93394 / Solar tracker geometry / Member archive

Ground-coverage-ratio backtracking: corrected angle base · case 04

Backtracking outputs a small angle with the wrong magnitude.

Member previewVariant 4 · 3 implementations · 7 checks per implementation

Case contract

Horizontal single-axis rows with ground coverage ratio gcr in (0, 1]. temp = |cos(ideal)|/gcr. When temp < 1 the rows would shade each other and the angle is corrected by -sign(ideal)*acos(temp) degrees (backtracking, flag True). gcr <= 0 disables backtracking. Return [angle rounded to 3, backtracking flag].

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: steep morning angle backtracks	`[49.681, true]`	`[-25.319, true]`	Failed

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