{
 "format": "LSC-1",
 "lsc": "LSC-1",
 "edition": "E1",
 "cut": "2026-10-09",
 "name": "THE KEPLER CARD",
 "handle": "kepler-orbits-card",
 "number": "Nº 1130",
 "house": "THE LABORATORY",
 "wing": "THE THIRTEEN EQUATIONS",
 "role": "orbits, their times and their places",
 "tagline": "T² = 4π²a³/G(M+m): the period of an orbit from its size and the size from its period (one day round the Earth is the geostationary orbit), where a body is on its ellipse, and the planets checked.",
 "sigil": "♁",
 "hue": "#2F7D3A",
 "punch": "72FDC403C1BCCDDE1509800E",
 "punch_of": "SKILL.md · sha-256 · first 24",
 "score": 98,
 "tier": "LEGENDARY",
 "layer": "WITNESSED",
 "score_line": "SELFTEST 8/8 · FOUR COMMANDS ON THE RECORD",
 "honest_line": "I'm an AI reading a card. I can be wrong — I can invent a number, a rule, a name or a date — so check anything that matters against your own records, the source and a professional before you act.",
 "term": "one purchase · yours to keep · nothing renews itself",
 "free": false,
 "wakes": "someone asks how long an orbit takes, how high a satellite sits, or where a body is",
 "loop": [
  "period <a> · the time round",
  "axis <T> · the size for a time",
  "where <e> <M> · on the ellipse",
  "planets · worked against measured",
  "say what the two-body law leaves"
 ],
 "laws": [
  "**Measured GM.** The Sun's, Earth's, the Moon's and Jupiter's GM are known far better than G or the masses alone; the card uses them.",
  "**Sidereal, not solar.** The geostationary orbit matches the sidereal day, 23 h 56 min 4 s.",
  "**Kepler's equation, solved.** M = E − e sin E, solved to 10⁻¹³ by Newton's method.",
  "**Two bodies.** The outer planets drift from the worked-out years because each pulls on the others; the card says so.",
  "**Ellipses only.** e ≥ 1 is an open orbit and is refused.",
  "**Checked against the sky.** The inner planets' years match the measured ones within 0.2%."
 ],
 "never": [
  "solve an open orbit as an ellipse",
  "ignore the other planets unsaid",
  "confuse sidereal and solar days"
 ],
 "machine": "scripts/kepler.py · period · axis · where · planets · selftest",
 "proof": "selftest 8/8 · FOUR commands on the record",
 "faces": [
  "card.svg",
  "card-machine.svg"
 ],
 "box": [
  "SKILL.md",
  "CARD.md",
  "TIN.md",
  "START-HERE.md",
  "LICENSE-NOTE.md",
  "THE-CLAUSES.md",
  "MY-LEDGER.md",
  "WITNESS.md",
  "SELFTEST.md",
  "AUDIT.md",
  "MANIFEST.md",
  "HOSTS.md",
  "scripts/kepler.py",
  "references/THE-LAWS.md",
  "rules/ (4 doors)",
  "system/ (2 prompts)",
  "mcp/mcp_card.py",
  "card.json",
  "card.svg",
  "card-machine.svg",
  "card.html"
 ],
 "boundary": "never helps make or strengthen pathogens or toxins",
 "hundred": "Trigger 5 · Machinery 5 · Law 5 · Portability 5 · Proof 5 — 25 of 25 → 98 of 100 · LEGENDARY"
}