{"slug":"academy/astronomy/en/lesson/keplers-laws-of-planetary-motion","route":"/library/academy/astronomy/en/lesson/keplers-laws-of-planetary-motion","title":"Kepler's Three Laws Describe Planetary Orbits","surface":"/library/academy/astronomy","audience":"academy","subject":"astronomy","locale":"en","source_repo":"koydo-app","source_path":"scripts/curriculum-authoring","route_source":"library_fallback","candidate_canonical_target_web":"/library/academy/astronomy/en/lesson/keplers-laws-of-planetary-motion","license":"ai-generated-koydo","attribution":null,"ai_provenance":{"model":"claude-opus-4-8","reviewed_at":"2026-06-24T19:15:45.434Z","reviewer_persona":"koydo-curriculum-expert-loop"},"provenance_blockers":["attribution_missing"],"content_types":["lesson","lesson_objectives","media_scene","drill","practice_set","quiz","feedback","character","citation","concept_map","progress","resume","review","remediation","next_step_path"],"normalized_content_types":["character","citation","concept_map","drill","feedback","lesson","media","next_step","practice_set","progress","quiz","remediation","resume","review"],"lesson_roles":["concept","guided_practice","knowledge_check","progress_summary","remediation","review"],"primary_lesson_role":"concept","objectives":["Identify the geometric shape of a planetary orbit and the location of the Sun within it according to Kepler's First Law.","Explain why a planet moves faster near perihelion and slower near aphelion using Kepler's Second Law.","Calculate the orbital period of a planet given its semi-major axis using Kepler's Third Law (T² ∝ a³).","Compare the orbital properties of two planets to predict which one moves faster at a given orbital distance.","Distinguish between the misconception that planets speed up near the Sun due to proximity alone versus the correct principle of conservation of angular momentum."],"activity_prompt":"Drag each orbital label to the correct position on the planetary orbit diagram","assessment_count":4,"assessment_shape":{"objective_count":5,"activity_present":true,"activity_prompt_present":true,"quiz_item_count":4,"quiz_items_with_answer_key":4,"quiz_items_with_explanation":4,"reward_present":true},"completion_criteria":["Review objectives and instruction","Complete the activity with manual learner confirmation","Answer every understanding-check item","Show completion feedback and reward only after the learner finishes the check"],"route_health":{"route":"/library/academy/astronomy/en/lesson/keplers-laws-of-planetary-motion","route_source":"library_fallback","candidate_canonical_target_web":"/library/academy/astronomy/en/lesson/keplers-laws-of-planetary-motion","local_route_resolvable":true,"sequence_links_resolvable":true,"owner_canonical_review_required":true,"canonical_route_write_allowed":false,"production_discoverability_evidence_present":false,"production_discoverability_claim_allowed":false,"evidence_scope":"Local route syntax and previous/next link check only; owner canonical-route review and production crawl/index evidence are still required before discoverability claims."},"context_route":"/api/library/ai-help-context?slug=academy%2Fastronomy%2Fen%2Flesson%2Fkeplers-laws-of-planetary-motion","grounding":["registry:academy/astronomy/en/lesson/keplers-laws-of-planetary-motion","source:koydo-app/scripts/curriculum-authoring","sha1:e0176109b61e2b7bd833ff98913c9d106f507fcc","title:Kepler's Three Laws Describe Planetary Orbits","concept:Celestial Mechanics","concept:Kepler's Laws","concept:Elliptical Orbits","concept:Equal Areas Equal Times","concept:Orbital Period","concept:Semi-Major Axis"],"privacy":["Do not send raw child free text without consent","Use source excerpts and non-identifying progress state only","Asset is not registry-gated"],"age_guardrails":["Adapt tone and examples for the academy audience.","Do not request sensitive personal data; use non-identifying learner progress only.","Keep help available only for this active, ungated asset context."],"measurement":["Log AI help usage by surface and asset slug","Evaluate answer quality against source-grounded rubric before production-readiness claims","Tie remediation prompts to completion, retry, or review outcomes"],"enabled":true,"blocked_reason":null,"tutor_prompt":"You are the KOYDO lesson tutor for this asset. Answer only from the source-grounded context listed in grounding, objectives, activity_prompt, and completion_criteria. When the source context is missing or ambiguous, say what evidence is missing instead of guessing. Do not request personal data, raw child free text, payment details, or consent decisions. Adapt explanations to the audience age tier and preserve KOYDO curriculum intent, citations, accessibility, and safety guardrails. Tie help to the learning loop: prerequisite review, current step, retry, completion feedback, remediation, review, or next route. Use assessment_shape, route_health, progress_policy, production_gate_policy, ai_eval_partnership, and real_ai_eval_evidence only as local deterministic constraints; do not treat them as production telemetry, mastery, discoverability, launch, release, or model-eval evidence. 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