{"schema":"https://ver.cy/schemas/card/1.0.0","id":"vr.tr.parallax","code":"thing-parallax","url":"https://ver.cy/models/thing/parallax/","name":"parallax","alternateNames":["heliocentric parallax","annual parallax","stellar parallax","geocentric parallax","diurnal parallax","horizontal parallax","solar parallax"],"kind":"thing","status":"published","version":"0.2.0-wave.1","language":"en","classifiers":{"family":"Thing Registry","category":"Physical world and living systems","entryKind":"noun.phenomenon","plane":"PHY","domain":["PHY.FLW"],"industry":[],"navPath":"","tags":[],"facets":{"substance":"energy","origin":"natural","agency":"inert","mobility":"not-applicable","scale":"not-applicable","affordances":["observable"]}},"whatItIs":"The apparent displacement of an object when viewed from two different positions not on a line with the object, used to measure distances, as in stellar (annual) parallax, diurnal parallax and stereo vision; also a source of error in reading instruments.","purpose":"Let an agent handle parallax by type, geometry, measurement and applications, including parallax error.","scope":{"in":[],"out":[],"boundaries":[]},"distinguishingFeatures":["Apparent shift from changing viewpoint","Larger for nearer objects","Basis of the parsec","Also an instrument reading error"],"structure":{"bundles":[{"id":"type","name":"Type","description":"Which parallax.","layers":[{"id":"kind","name":"Kind","description":"Stellar, diurnal, stereo.","findings":[{"id":"kind-finding","name":"Kind","description":"Parallax type.","questions":[{"text":"Which kind of parallax is meant?","kind":"definition"},{"text":"What is the baseline?","kind":"measurement"}]}]},{"id":"geometry","name":"Geometry","description":"Triangle.","findings":[{"id":"geometry-finding","name":"Geometry","description":"Geometry.","questions":[{"text":"How does the geometry give distance?","kind":"definition"},{"text":"What small-angle approximation is used?","kind":"definition"}]}]}]},{"id":"astronomy","name":"Astronomy","description":"Stellar distances.","layers":[{"id":"value","name":"Value","description":"Parallax angle.","findings":[{"id":"value-finding","name":"Value","description":"Parallax value.","questions":[{"text":"What is the star parallax and its uncertainty?","kind":"measurement"},{"text":"From which catalogue?","kind":"provenance"}]}]},{"id":"distance","name":"Distance","description":"Conversion.","findings":[{"id":"distance-finding","name":"Distance","description":"Distance.","questions":[{"text":"What distance does the parallax imply?","kind":"measurement"},{"text":"Is simple inversion valid at this uncertainty?","kind":"boundary"}]}]}]},{"id":"measurement","name":"Measurement","description":"Parallax error.","layers":[{"id":"error","name":"Error","description":"Instruments.","findings":[{"id":"error-finding","name":"Error","description":"Parallax error.","questions":[{"text":"Is the scale read straight on to avoid parallax error?","kind":"action"},{"text":"Does the instrument have a mirror strip?","kind":"definition"}]}]},{"id":"stereo","name":"Stereo","description":"Depth.","findings":[{"id":"stereo-finding","name":"Stereo","description":"Stereo depth.","questions":[{"text":"How is parallax used in stereo imaging or vision?","kind":"definition"},{"text":"What baseline is needed?","kind":"measurement"}]}]}]},{"id":"learning","name":"Learning","description":"Teaching.","layers":[{"id":"demo","name":"Demonstration","description":"Thumb test.","findings":[{"id":"demo-finding","name":"Demonstration","description":"Demonstration.","questions":[{"text":"How can parallax be demonstrated simply?","kind":"action"},{"text":"What does it show?","kind":"definition"}]}]},{"id":"history","name":"History","description":"First measurements.","findings":[{"id":"history-finding","name":"History","description":"History.","questions":[{"text":"When was stellar parallax first measured, according to historians?","kind":"provenance"},{"text":"Why did it matter?","kind":"definition"}]}]}]}]},"agentConduct":{"may":["Explain parallax and use it to calculate distances with stated uncertainty.","Warn users about parallax error when reading instruments."],"mustNot":["Report an instrument reading taken at an angle without correcting or flagging parallax error.","Present uncertain parallax distances as precise."],"requiresHuman":["Relying on a parallax-based measurement for safety-critical work."]},"ethics":{"considerations":["Reading errors can lead to wrong doses or settings.","Distance scales in astronomy depend on careful measurement."],"affectedParties":["People relying on instrument readings","Researchers"]},"owners":{"steward":"Nobody: a physical phenomenon held in common.","roles":[],"masterSystems":["Astrometric star catalogues"]},"relations":[{"target":"oewn-11511038-n","type":"parent","note":"registry parent class"},{"target":"optical phenomenon","type":"related","note":"category"},{"target":"distance","type":"related","note":"quantity"},{"target":"parsec","type":"related","note":"unit"},{"target":"astrometry missions","type":"related","note":"instruments"}],"interaction":{"identity":{"applicability":"required","items":["Vercy registry: vr.tr.parallax","Open English WordNet: oewn-11548676-n"]},"properties":{"applicability":"required","items":["parsec: about 3.26 light-years - distance at 1 arcsecond parallax"]},"recognition":{"applicability":"required","items":["Parallax angles in arcseconds","Parsec defined by parallax","Parallax error on dial gauges","An apparent shift of a nearby object against a distant background."]},"capabilities":{"applicability":"required","items":["compute distances from parallax angles","avoid parallax error when reading scales","use stereo imaging","look up stellar parallaxes"]},"hazards":{"applicability":"required","items":["Reading gauges from an angle","Ignoring measurement uncertainty for distant stars"]},"interfaces":{"applicability":"required","items":["IAU definition of the parsec"]},"context":{"applicability":"required","items":["Measuring distances to stars and objects, and depth perception.","stellar (annual) parallax","diurnal parallax","binocular and stereo parallax","parallax error in measurement"]}},"sources":[{"title":"Open English WordNet 2024, synset oewn-11548676-n","url":"https://en-word.net/id/oewn-11548676-n","note":"sense and gloss of the concept"},{"title":"Wiktionary: parallax","url":"https://en.wiktionary.org/wiki/parallax","note":"word senses and usage"}],"openQuestions":["Should parallax types be separate entries?","How should astrometry catalogues be linked?","How should parallax error guidance be linked?"],"resources":{"spec":"/models/things/publications/thing-parallax/spec.json"},"provenance":{"origin":"thing registry research (pass 2)","builtFrom":["models/things/publications/thing-parallax/spec.json"],"providers":["Claude"],"researchStatus":"unreviewed","generatedAt":"2026-09-11T08:41:57Z","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":"filled","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 2026-10-07T12:16:28+00:00: completeness 1.00; sense: WordNet gloss; 2 live sources; review by codex: pass"},"score":1.0}}