FA-93805 / Solar tracker geometry / Member archive

Dawn and dusk parking positions: night boundary · case 05

At the moment of sunrise the tracker stays flat instead of parking toward the sun.

Member previewVariant 5 · 3 implementations · 7 checks per implementation

Case contract

sun_el < 0: [0.0, 'night']. 0 <= sun_el < wake_el: park facing the low sun, [-east_lim, 'dawn'] in the morning (am true) or [west_lim, 'dusk'] in the evening. Otherwise track the ideal angle clamped to the asymmetric limits [-east_lim, west_lim] ('track'). Angles are floats.

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: sun exactly on horizon	`[0.0, "night"]`	`[-50.0, "dawn"]`	Failed

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