FA-55487 / Astronomical coordinate conventions / Member archive
Planetary body fixed labels: Planetographic latitude adapter applies the inverse supplied flattening factor · case 02
The adapter reports an incorrect geodetic tangent while other fields remain valid.
Case contract
This explicitly stipulated planetary atlas uses west-positive input longitude W, east-positive prime-meridian angle P, latitude B, and an equatorial mirror flag for a southern view. Body-fixed east longitude is -W; inertial longitude adds P. Supplied sin-latitude ratio g is already calibrated and not recomputed. Output fields are defined by: east_longitude = (-d['W'])%360; inertial_longitude = (d['P']-d['W'])%360; view_latitude = -d['B'] if d['south'] else d['B']; geodetic_tangent = d['g']*d['latratio']; future_prime_meridian = (d['P']+d['rate']*d['dt'])%360; future_body_longitude = (-d['W']-d['rate']*d['dt'])%360
Why this case matters
Catalog, detector, sky-coordinate, and spectroscopy adapters must preserve the association between numeric coordinates and their declared reference conventions.
One recorded failure
Sample boundary fixtureThis sample comes from the broken implementation of a controlled reproducer.
| Boundary fixture | Actual | Expected | Outcome |
|---|---|---|---|
| astronomical fixture 0 | {"east_longitude": 319, "future_body_longitude": 305, "future_prime_meridian": 114, "geodetic_tangent": 0.6666666666666666, "inertial_longitude": 59, "view_latitude": 20} | {"east_longitude": 319, "future_body_longitude": 305, "future_prime_meridian": 114, "geodetic_tangent": 6, "inertial_longitude": 59, "view_latitude": 20} | Failed |
MEMBER ARCHIVE
The complete case is available to members.
This record includes three runnable implementations, regression fixtures, execution results, and source hashes.
Member access is invitation-based. Sign in with your invited account to inspect the sources.
Sign in to the archive ↗