FA-12175 / Astronomical coordinate conventions / Member archive

Radio and optical velocity conventions use different frequency denominators · case 05

Radio and optical velocity conventions use different frequency denominators.

Member previewVariant 5 · 3 implementations · 6 checks per implementation

Case contract

Positive integer frequencies f and rest; mode radio or optical. Return reduced rational v/c string: (rest-f)/rest for radio, (rest-f)/f for optical. This tests convention conversion, not a relativistic physical speed.

Why this case matters

Astronomical coordinate adapters must preserve convention semantics. Primary background: https://docs.astropy.org/en/stable/units/equivalencies.html

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
radio redshift	`"1"`	`"1/2"`	Failed

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