FA-93350 / Solar tracker geometry / Member archive

Horizontal single-axis true tracking: rotation reference direction · case 05

The tracker faces west in the morning and east in the afternoon.

Member previewVariant 5 · 3 implementations · 7 checks per implementation

Case contract

Sun azimuth clockwise from north and elevation in degrees. The horizontal axis points to axis_az; rotation is positive toward azimuth axis_az+90. Sun vector east=cos(el)sin(az), north=cos(el)cos(az), up=sin(el). Rotation = atan2(component along axis_az+90, up). Clamp to +-max_angle (status 'limited', else 'tracking'); sun_el <= 0 returns [0.0, 'night']. Round to 3 decimals.

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: low morning sun hits east limit	`[60.0, "limited"]`	`[-60.0, "limited"]`	Failed

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