d5a5a0fc3a75fd8af9d9ed1a741826a3e2c3c17e
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Commits
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  SenrokaiandClaude Opus 5.5
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69cada7914 |
Fail the ETL when re-rating a locked moon moves its pole or W off the kernel's at the present
lockedToOrbit re-rates a locked moon's W and node terms and moves their constants so that on 2025-01-01, the date the IAU's elements were fitted near, the pole and W are the kernel's own. Nothing checked it: with the constants left where they were, the solar ETL passed and the suite passed, though every re-rated moon moved (Rhea's pole 0.018 degrees, Triton 0.0054, Miranda 0.0037, Europa 0.0027, Callisto 0.0021, Deimos 0.0016, Ganymede 0.0016, measured on the bodies.json it wrote; before the drawn node rates were corrected, Mimas's W moved 0.21 and Miranda's pole 0.12). lockedToOrbit now compares orientationAt at PRESENT_JD before and after, Iapetus's pole round its orbit included, and throws past 1e-6 degrees. Measured on the shipped catalogue: at most 4.7e-10 (Deimos's W, some 2.6 million degrees round), the pole exactly. Guarded mutants, each through the solar ETL on the real catalogue: - node terms' constants not moved: "Deimos's pole or W on 2460676.5 is 1.60e-3 degrees from the IAU's". - W's constant not moved: Deimos, 9.12e-2. - the check disabled with the first: the ETL passes (control). The unit suite does not see it: the check runs on the kernel, which only the ETL reads. The ETL writes the same bodies.json as before. Unit suite 866 passed. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> |
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SenrokaiandClaude Opus 5.5
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24c7be1bae |
Draw four moons' nodes at JPL's current rates, which Horizons and the IAU's poles agree with
The archived satellite table the moons are read from gives older node
periods than JPL's current one for Miranda (17.727 years against URA182's
17.787), Ganymede (132.654 against 137.812), Callisto (338.82 against
577.264) and Titan (704.60 against 687.370), and
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SenrokaiandClaude Opus 5.5
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74ea1d655e |
Turn a locked moon's pole round with its drawn node, so its axis stays on its orbit at every date the clock reaches
The IAU carries a locked moon's pole round its orbit normal on a term of the node's angle, as a moon in a Cassini state keeps it, but at the node rate the IAU's source had: Miranda's U11 at -2024.22 degrees a century where the JPL table its orbit is drawn from has -2030.80, Mimas's S3 at -36505.5 against -36511.16. Over AD 1-3000 that parted Miranda's drawn axis from its drawn orbit normal by up to 7.89 degrees (AD 9), so Uranus swung 7.6 degrees north and south on its sky every 1.41 days, and Mimas's by 2.63. Only Iapetus's pole had been put on its orbit. lockedToOrbit now sets every periodic term whose angle turns within 5 per cent of k times the drawn node rate (k from 1 to 9, the most the report takes, Triton's) to exactly that multiple, and moves its constant so the angle, and the pole and W with it, are unchanged on 2025-01-01 (the 2025 pole and W of every changed moon are identical to the 1e-14 degree). Measured: the largest offset taken is Ganymede's J5, 3.4e-2, then Rhea's 1.2e-2; the nearest term that is not a node is 6.0e-2 out (a W-only term of Miranda's), and Umbriel's W has one 1.0e-2 from ten times its node, which the k limit leaves. Ten moons change: Deimos, Io, Europa, Ganymede, Mimas, Tethys, Rhea, Miranda, Triton and Proteus. The Moon and Phobos, whose W carries a quadratic, are left as before, and so is Callisto's J6, 40 per cent from its node rate. Worst angle between the spin axis and the drawn orbit normal over AD 1-3000, every 135 days, before and after: Miranda 7.89 -> 0.42, Mimas 2.63 -> 0.47, Rhea 0.77 -> 0.17, Triton 0.51 -> 0.15, Europa 0.33 -> 0.13, Ganymede 0.50 -> 0.16. Faces: Miranda 2.75 -> 2.39, Mimas 8.94 -> 8.89, Deimos 2.14 -> 2.08, Triton 2.88 -> 2.81; none got worse. build.ts now checks that angle for every locked moon over the same 8114 dates as the face check, at most 1 degree (Tethys 0.97, whose IAU pole sits 0.69 from its orbit today; Titan 0.94, whose IAU pole is still while its node turns in 705 years), with four named ceilings: the Moon 7.1 (its real 6.7-degree tilt, 6.98 at worst), Phobos 2 and Deimos 2 (1.81 and 1.74) and Proteus 1.2 (1.09), whose IAU poles nod with Mars's and Neptune's precessing poles while the Laplace poles their orbits are drawn round are fixed. The obliquity check at Horizons' epoch shares the new axisFromOrbitDeg with it. Nothing checked the axis against the orbit before: an Iapetus pole left on its Laplace pole, 8.30 degrees off at every date, passed the ETL and the suite. Guarded mutants, each through the solar ETL and then the suite on the data it wrote: - node terms left at the IAU rates: the ETL fails with "Moon mimas's spin axis leans up to 2.63 degrees ... (at most 1 expected)", and the suite with only the new test failing; - Iapetus's pole put on its Laplace pole, W re-phased so its face today is unchanged (worst face 16.41, under its 16.5 ceiling): the ETL fails with "Moon iapetus's spin axis leans up to 8.30 degrees", and the suite with only the new test failing. Also: lockedToOrbit called the Iapetus normal's circle "8.3 degrees across"; 8.3 is its radius (the row's i = 8.298 to the Laplace plane) and it is 16.6 across. The README credited every rotation to pck00011 without saying that a locked moon's W and node terms are re-rated to its JPL mean elements and Iapetus's pole carried round its orbit normal; both of its lines now say so, as the body model's doc does. Unit suite 858/858, etl:typecheck and tsc -p tsconfig.app.json clean, solar ETL passes on the real data. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> |
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SenrokaiandClaude Opus 5.5
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3b4fd1af6c |
Turn each locked moon at its orbit's rate and Iapetus's pole round its orbit, so they face their planets at every date the clock reaches
The IAU gives a locked moon's W the mean motion of whichever orbit its authors had, and JPL's table has another. Near the present the difference is nothing; over the clock's AD 1 to 3000 it turned Proteus's far side to Neptune at AD 1 (146 degrees), Mimas 52 degrees from Saturn and Miranda 23. Iapetus was worse for another reason: its IAU pole is a straight line, 3.9 degrees a century in right ascension, through its orbit normal's 3 439-year circle round the Laplace pole, which by AD 1 has run past the celestial pole (Dec 97.9), 11 degrees off the orbit, with the face 87 degrees from Saturn. Mimas and Iapetus carry mission maps, so a wrong hemisphere was drawn facing Saturn. The ETL's lock check sampled only 1950-2100, so none of it failed. tools/etl/lib/locked-spin.ts, lockedToOrbit, called for every locked moon: - W's rate becomes the orbit's own mean motion, its constant moved so W is unchanged on 2025-01-01; the pole and every periodic term stay the IAU's. A W with a quadratic is left (Phobos's orbit already takes it; the Moon's is its tidal slowing, 0.75 degrees at AD 1). The kernel's rate must be within 1e-5 of the orbit's first (at most 3.4e-6, Iapetus). - Iapetus (poleFollowsOrbit): the pole follows its orbit normal, as a moon in a Cassini state does, in the IAU's own form: sines of the node's angle and four harmonics on right ascension, cosines on declination, fitted to the normal's circle and pinned to the IAU pole at the present; W takes sines of the same angles, fitted to hold the face where it is today. build.ts samples the lock over AD 1 to 3000 (8 114 dates, every 135 days) instead of 1950-2100, and subPlanetLongitudeDeg moved to the lib, shared by both. Measured on the real catalogue: at most 5.36 degrees (Titan) but the Moon 7.62 (its eccentricity, and W's quadratic at AD 1: a new named ceiling of 8), Mimas 8.94 (ceiling 11 -> 9.5) and Iapetus 15.95 (19 -> 16.5, 9.4 of it its row's lag); Proteus's own ceiling of 9 is gone, at 2.66. Iapetus's axis stays within 0.74 degrees of its orbit normal (11.06 before) and its pole is the IAU's at the present to 1e-4 degrees. Live on :4301, the longitude facing the planet at AD 1 / 1000 / 2025 / 2999: Proteus 2.6 / 2.6 / 2.6 / 2.6 (was -146.5 / -72.9 / 2.6 / 74.5), Iapetus -15.9 / -15.4 / -15.3 / -9.3 (-87.0 / -50.9 / -15.3 / 22.8), Mimas 4.1 / 6.8 / 5.7 / 8.4 (48.6 / 29.3 / 5.7 / -13.0), Miranda -0.1 / 2.2 / 0.0 / 1.4 (-23.4 / -9.6 / 0.0 / 12.6); the present is unchanged. The renderer spec now takes the rotational elements from bodies.json too, so no hand copy is left, and a new test turns Proteus, Miranda, Mimas and Iapetus to their planets at AD 1 and AD 3000. Guarded mutants, each run through the solar ETL and then the full suite on what it wrote: lockedToOrbit bypassed (validator: Mimas 52.30, ceiling 9.5; the new test fails), Iapetus on the IAU's straight pole (98.48), and its pole round the orbit without W's terms (73.13); each fails the new test and only it. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> |