FA-93512 / Solar tracker geometry / Member archive

Heliostat mirror normal aiming: sun vector components · case 02

Mirrors aim as if the sun were mirrored about the north-east diagonal.

Member previewVariant 2 · 3 implementations · 7 checks per implementation

Case contract

mirror and receiver are [east, north, up] positions in metres. The mirror normal bisects the unit sun vector (east=cos(el)sin(az), north=cos(el)cos(az), up=sin(el)) and the unit vector from the mirror to the receiver. Return [normal azimuth 0..360 clockwise from north, normal elevation], rounded to 3; None when sun_el <= 0; 'invalid' when receiver equals mirror.

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: receiver due north on tower	`[312.709, 52.321]`	`[180.0, 87.5]`	Failed

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

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