{"schema":"https://ver.cy/schemas/card/1.0.0","id":"vr.tr.axis-of-rotation","code":"thing-q516175","url":"https://ver.cy/models/thing/q516175/","name":"axis of rotation","alternateNames":["axis of revolution","axis of spin","Euler axis","pitch axis","longitudinal axis","yaw axis","galactic pole","trim"],"kind":"thing","status":"published","version":"0.2.0-wave.1","language":"en","classifiers":{"family":"Thing Registry","category":"Cross-cutting context","entryKind":"thing","plane":"XCT","domain":["XCT.QTY"],"industry":[],"navPath":"","tags":[],"facets":{}},"whatItIs":"The line about which a body rotates or revolves, such as the axis of the Earth tilted about 23.4 degrees from the perpendicular to its orbital plane, the pitch, roll and yaw axes of aircraft, and the Euler axis used to describe arbitrary rotations; moment of inertia depends on the chosen axis.","purpose":"Let an agent explain axes of rotation in physics, engineering, astronomy and aviation, with correct conventions and calculations.","scope":{"in":[],"out":[],"boundaries":[]},"distinguishingFeatures":["Line about which rotation occurs","Fixed or moving","Defines angular quantities","Affects moment of inertia"],"structure":{"bundles":[{"id":"physics","name":"Physics","description":"Rotation.","layers":[{"id":"identify","name":"Identify","description":"Which axis.","findings":[{"id":"identify-finding","name":"Identify","description":"Axis identification.","questions":[{"text":"About which axis does this body rotate?","kind":"definition"},{"text":"Is it fixed or moving?","kind":"boundary"}]}]},{"id":"inertia","name":"Inertia","description":"Moment of inertia.","findings":[{"id":"inertia-finding","name":"Inertia","description":"Moment of inertia.","questions":[{"text":"What is the moment of inertia about this axis?","kind":"measurement"},{"text":"How does the parallel axis theorem apply?","kind":"definition"}]}]}]},{"id":"aviation","name":"Aviation","description":"Aircraft axes.","layers":[{"id":"axes","name":"Axes","description":"Pitch, roll, yaw.","findings":[{"id":"axes-finding","name":"Axes","description":"Aircraft axes.","questions":[{"text":"How do pitch, roll and yaw axes relate to aircraft controls?","kind":"definition"},{"text":"Which control surfaces act on each?","kind":"definition"}]}]},{"id":"conventions","name":"Conventions","description":"Sign conventions.","findings":[{"id":"conventions-finding","name":"Conventions","description":"Conventions.","questions":[{"text":"Which sign conventions does this standard use?","kind":"provenance"},{"text":"How do body and earth axes differ?","kind":"definition"}]}]}]},{"id":"astronomy","name":"Astronomy","description":"Planets.","layers":[{"id":"tilt","name":"Tilt","description":"Axial tilt.","findings":[{"id":"tilt-finding","name":"Tilt","description":"Axial tilt.","questions":[{"text":"What is the axial tilt of this planet, according to IAU or NASA data?","kind":"provenance"},{"text":"How does it cause seasons?","kind":"definition"}]}]},{"id":"precession","name":"Precession","description":"Changing axes.","findings":[{"id":"precession-finding","name":"Precession","description":"Precession.","questions":[{"text":"How does axial precession change the direction of the axis over time?","kind":"definition"},{"text":"Over what period?","kind":"measurement"}]}]}]},{"id":"engineering","name":"Engineering","description":"Machines.","layers":[{"id":"shafts","name":"Shafts","description":"Rotating machinery.","findings":[{"id":"shafts-finding","name":"Shafts","description":"Rotating machinery.","questions":[{"text":"How is balancing done about the rotation axis?","kind":"definition"},{"text":"What vibration limits apply?","kind":"provenance"}]}]},{"id":"euler","name":"Euler","description":"Rotation representation.","findings":[{"id":"euler-finding","name":"Euler","description":"Euler axis.","questions":[{"text":"How are rotations represented by an axis and angle or quaternions?","kind":"definition"},{"text":"When is each used?","kind":"definition"}]}]}]}]},"agentConduct":{"may":["Calculate and report rotation axes, stating sign conventions and reference frames.","Check that a rotation model uses the correct axis for moment of inertia."],"mustNot":["Mix sign or axis conventions between systems without stating the conversion.","Present a rotation calculation as verified for a vehicle, aircraft or machine without review.","Command rotation of a machine about an axis without confirming the area is clear."],"requiresHuman":["Using a rotation model to control an aircraft, spacecraft or heavy machine."]},"ethics":{"considerations":["Axis errors in control software have crashed spacecraft and aircraft; checking conventions protects lives."],"affectedParties":["Operators and passengers of controlled vehicles","Engineers and students"]},"owners":{"steward":"Nobody owns the concept; the engineer answers for each model that uses it.","roles":[],"masterSystems":[]},"relations":[{"target":"Q138638473","type":"parent","note":"registry parent class"},{"target":"axis","type":"related","note":"category"},{"target":"rotational dynamics","type":"related","note":"field"},{"target":"inertia","type":"related","note":"property"},{"target":"angular measure","type":"related","note":"measure"}],"interaction":{"identity":{"applicability":"required","items":["Vercy registry: vr.tr.axis-of-rotation","Wikidata: Q516175 (https://www.wikidata.org/wiki/Q516175)"]},"properties":{"applicability":"not-applicable","items":["Earth axial tilt: about 23.4 degrees - current value"]},"recognition":{"applicability":"optional","items":["Lines through spinning objects","Pitch, roll and yaw diagrams","An axis of symmetry need not be a rotation axis","Not physical; an imaginary line shown in diagrams."]},"capabilities":{"applicability":"required","items":["identify the axis of rotation","compute moment of inertia about an axis","explain aircraft pitch, roll and yaw","explain Earth axial tilt and seasons"]},"hazards":{"applicability":"required","items":["Sign convention errors","Using the wrong axis for moment of inertia"]},"interfaces":{"applicability":"required","items":["ISO 1151 flight dynamics axes","IAU conventions for planetary rotation"]},"context":{"applicability":"required","items":["Describing and analysing rotation.","fixed axes","instantaneous axes","principal axes","aircraft body axes","planetary rotation axes"]}},"sources":[{"title":"Wikidata item Q516175: axis of rotation","url":"https://www.wikidata.org/wiki/Q516175","note":"identity and sense of the item"},{"title":"Wikipedia: Axis of rotation","url":"https://en.wikipedia.org/wiki/Axis_of_rotation","note":"general description of the item"}],"openQuestions":["Should axis types be separate entries?","How should conventions be linked?","How should planetary data be linked?"],"resources":{"spec":"/models/things/publications/thing-q516175/spec.json"},"provenance":{"origin":"thing registry research (pass 2)","builtFrom":["models/things/publications/thing-q516175/spec.json"],"providers":["Claude"],"researchStatus":"unreviewed","generatedAt":"2026-09-11T13:26:00Z","builder":"tools/build_cards.py@1.0.0"},"completeness":{"sections":{"classifiers":"filled","whatItIs":"filled","purpose":"filled","distinguishingFeatures":"filled","structure":"filled","agentConduct":"filled","ethics":"filled","owners":"filled","relations":"filled","interaction.identity":"filled","interaction.properties":"not-applicable","interaction.recognition":"filled","interaction.capabilities":"filled","interaction.hazards":"filled","interaction.interfaces":"filled","interaction.context":"filled","sources":"filled"},"notes":{"_gate":"Published through the thing publication gate 1.0 on 2026-10-07T10:10:31+00:00: completeness 1.00; sense: Wikidata description; 2 live sources; review by codex: pass","interaction.properties":"Plane XCT: no invented physical properties."},"score":1.0}}