FA-12163 / Astronomical coordinate conventions / Member archive

Propagation confuses a catalog reference epoch with its observation epoch · case 03

Propagation confuses a catalog reference epoch with its observation epoch.

Member previewVariant 3 · 3 implementations · 6 checks per implementation

Case contract

Toy linear catalog: position x is defined at reference epoch ref; observed is provenance only; return x+rate*(target-ref). Epochs are arbitrary integer model ticks.

Why this case matters

Astronomical catalog and observation adapters must preserve the declared coordinate convention across software boundaries.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
different provenance	`9`	`13`	Failed

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