{ "model": { "rank": 2799, "code": "thing-q123524", "model_id": "vr.tr.solstice", "name": "solstice", "purpose": "Let an agent explain solstices and their astronomical cause, relay dates and variations, describe cultural observances with attribution, and distinguish solstices from equinoxes and from meteorological seasons.", "family": "Thing Registry", "category": "Cross-cutting context", "status": "research-draft", "kind": "thing", "plane": "XCT", "domain": "XCT.QLT", "industry": "", "version": "", "url": "/models/thing/q123524/", "tier": 2, "score": 97, "payload": { "layer": "wikidata", "aliases": [ "Mars southern solstice", "winter solstice", "December solstice", "June solstice", "summer solstice", "Blue Christmas" ], "aliasCount": 6, "merged": 6, "knownIn": 97, "facets": null, "markers": [], "lexicalClass": "", "senseRank": null, "alsoRegisteredAs": null, "source": { "dataset": "wikidata", "item": "Q123524", "url": "https://www.wikidata.org/wiki/Q123524", "license": "CC0 1.0" } }, "research": { "vercy": "1.0-draft", "publication": { "status": "research-draft", "adjudicationStatus": "unreviewed", "publishableCanonical": false, "generatedAt": "2026-09-13T01:37:50Z", "providers": [ "Claude" ], "breadth": "written by Claude from model knowledge without web access - no source was read, every claim is a lead to verify", "pass": 2, "wave": 3, "engine": "claude" }, "metaModel": { "id": "THING-Q123524", "registryId": "vr.tr.solstice", "name": "solstice", "version": "0.2.0-wave.3", "entryKind": "thing", "family": "Thing Registry", "domain": [ "XCT.QLT" ], "status": "research-draft" }, "canonicalUrl": "https://ver.cy/models/thing/q123524/", "model": { "registry_id": "vr.tr.solstice", "name": "solstice", "purpose": "Let an agent explain solstices and their astronomical cause, relay dates and variations, describe cultural observances with attribution, and distinguish solstices from equinoxes and from meteorological seasons.", "definition": "The moment twice a year when the Sun reaches its greatest northern or southern declination, giving the longest day at the June solstice and the shortest at the December solstice in the northern hemisphere and the reverse in the southern, marking astronomical summer and winter, caused by the tilt of the Earth axis; solstices occur on other planets such as Mars, are celebrated in festivals from Stonehenge gatherings to Yule and Dongzhi, and are used as calendar and cultural markers.", "what_it_is_for": "Not applicable; an astronomical event.", "affordances": [ "explain the astronomy", "relay dates and variations", "describe cultural observances", "distinguish from equinoxes" ], "distinguishing_features": [ "Extreme day length", "Axial tilt cause", "Hemisphere reversal", "Cultural festivals" ], "appearance": "Not a visible object; the Sun at its extreme rising and setting points.", "visual_identification": [ "Sun at maximum declination", "June and December solstices, summer and winter solstices, Martian solstices", "Equinoxes are when day and night are equal; meteorological seasons use calendar months" ], "physical_properties": [ { "quantity": "axial tilt of Earth", "typical_range": "23.44", "unit": "degrees", "note": "" }, { "quantity": "June solstice date", "typical_range": "20-22", "unit": "June", "note": "" }, { "quantity": "December solstice date", "typical_range": "20-23", "unit": "December", "note": "" } ], "families_and_kinds": [ "June solstice", "December solstice", "summer and winter solstices by hemisphere", "solstices on other planets such as Mars", "solstice observances such as Yule, Dongzhi, Inti Raymi and midsummer", "Blue Christmas services near the December solstice" ], "related_models": [ { "relation": "is a kind of", "target": "astronomical phenomenon", "why": "in registry terms" }, { "relation": "is a kind of", "target": "annual event", "why": "in registry terms" }, { "relation": "is a kind of", "target": "maxima and minima", "why": "in registry terms" }, { "relation": "is contrasted with", "target": "equinox", "why": "the midpoint events" } ], "identifiers": [], "standards_and_regulation": [ "No regulation; astronomical almanacs define the times" ], "failure_modes_and_hazards": [ "Confusing solstice with equinox", "Assuming the solstice is the hottest or coldest day", "Wrong dates by hemisphere" ], "in_scope": [], "out_of_scope": [], "characteristics": [] }, "sources": [], "structure": { "bundles": [ { "id": "understand", "name": "Understand", "description": "What a solstice is.", "rationale": "Science.", "layers": [ { "id": "definition", "name": "Definition", "description": "Definition and cause.", "findings": [ { "id": "definition-finding", "name": "Definition", "description": "Definition.", "questions": [ { "text": "What is a solstice, and how does axial tilt cause it?", "kind": "definition" }, { "text": "Is the question about a solstice, an equinox or a meteorological season?", "kind": "boundary" } ] } ] }, { "id": "dates", "name": "Dates", "description": "Dates and timing.", "findings": [ { "id": "dates-finding", "name": "Dates", "description": "Dates.", "questions": [ { "text": "When do the solstices occur, and why do the dates vary?", "kind": "measurement" }, { "text": "Which entry fits the specific solstice?", "kind": "action" } ] } ] } ] }, { "id": "observe", "name": "Observe", "description": "Observation.", "rationale": "Science.", "layers": [ { "id": "sky", "name": "Sky", "description": "Sun path and daylight.", "findings": [ { "id": "sky-finding", "name": "Sky", "description": "Sky.", "questions": [ { "text": "How do the Sun path, sunrise points and daylight hours change at the solstices by latitude?", "kind": "provenance" }, { "text": "Which entry fits daylight?", "kind": "action" } ] } ] }, { "id": "planets", "name": "Planets", "description": "Solstices on other planets.", "findings": [ { "id": "planets-finding", "name": "Planets", "description": "Planets.", "questions": [ { "text": "How do solstices work on Mars and other planets?", "kind": "provenance" }, { "text": "Which references are standard?", "kind": "provenance" } ] } ] } ] }, { "id": "culture", "name": "Culture", "description": "Culture and festivals.", "rationale": "Attribution.", "layers": [ { "id": "festivals", "name": "Festivals", "description": "Festivals.", "findings": [ { "id": "festivals-finding", "name": "Festivals", "description": "Festivals.", "questions": [ { "text": "What solstice festivals exist, from midsummer and Yule to Dongzhi and Inti Raymi, with attribution?", "kind": "provenance" }, { "text": "Which entry fits the specific festival?", "kind": "action" } ] } ] }, { "id": "monuments", "name": "Monuments", "description": "Ancient alignments.", "findings": [ { "id": "monuments-finding", "name": "Monuments", "description": "Monuments.", "questions": [ { "text": "What monuments align with the solstices, and what do archaeologists say about them?", "kind": "provenance" }, { "text": "Which sources are cited?", "kind": "provenance" } ] } ] } ] }, { "id": "context", "name": "Context", "description": "History and calendars.", "rationale": "Context.", "layers": [ { "id": "history", "name": "History", "description": "History of understanding.", "findings": [ { "id": "history-finding", "name": "History", "description": "History.", "questions": [ { "text": "How did ancient astronomers determine the solstices?", "kind": "provenance" }, { "text": "Which entry fits the history of astronomy?", "kind": "action" } ] } ] }, { "id": "calendars", "name": "Calendars", "description": "Calendars.", "findings": [ { "id": "calendars-finding", "name": "Calendars", "description": "Calendars.", "questions": [ { "text": "How do calendars and season definitions use the solstices?", "kind": "provenance" }, { "text": "Which entry fits season?", "kind": "action" } ] } ] } ] } ] }, "openQuestions": [ "Should June and December solstices be separate entries?", "How should almanac sources be linked?", "The registry entry has merged aliases naming observances and planetary events; should they be split off?" ], "statistics": { "bundles": 4, "layers": 8, "findings": 8, "questions": 16 } }, "draft": { "generator": "vr.draft.v3", "status": "draft-generated", "researched": false, "archetype": "abstract concept", "method": "Written from the archetype playbook - what this kind of thing needs beyond identity and provenance - and from the structure that recurred across 6,333 models already researched by two engines. Applied to this entry by rule. No source was read for this thing and no claim here is researched. This entry carries no facets of its own, so they were inferred from its domain - a guess about a whole domain applied to one thing.", "facetsInferred": true, "nextPass": "A researcher replaces this draft with a sourced specification. Treat every sentence below as a proposal to argue with.", "purpose": "Give an agent a durable, checkable way to recognise a solstice, record what state it is in, and decide what may be done with it.", "whatItIs": "Let an agent explain solstices and their astronomical cause, relay dates and variations, describe cultural observances with attribution, and distinguish solstices from equinoxes and from meteorological seasons.", "characteristics": { "substance": "abstract", "origin": "conceptual", "agency": "inert" }, "whatYouCanDoWithIt": [ "observed and measured" ], "distinguishingFeatures": [ "Names folded into this entry, which a task may need to split apart again: Mars southern solstice, winter solstice, December solstice, June solstice, summer solstice, Blue Christmas.", "6 finer distinctions are held as aliases rather than separate entries, because telling them apart needs a task that asks for it.", "Described in 97 Wikipedia languages, which is a measure of how widely the thing is known, not of how important it is." ], "openQuestionsForResearch": [ "Which of the bundles below does a real task actually need, and which are ceremony?", "What does this thing have that the facets do not capture at all?", "Which neighbouring kind is most often confused with a solstice, and on what evidence are they told apart?" ], "whatItIsMadeOf": "an abstraction with no physical instance", "physicalCharacter": [ "Does nothing on its own; everything it does, something else did to it.", "These come from the domain this entry sits in rather than from the entry itself, so treat them as a first guess about the whole domain applied to one thing." ], "whatCanBeDoneWithIt": [ "observe it, measure it, record its state" ], "howItIsRecognised": [ "Nothing to see. What is recognised is an instance of it, and which instances count is exactly what is argued about." ], "relatedModels": [ { "relation": "covers", "note": "Finer kinds folded into this entry because telling them apart needs a task that asks for it. Each is a model waiting to be split out when one does.", "targets": [ "Mars southern solstice", "winter solstice", "December solstice", "June solstice", "summer solstice", "Blue Christmas" ] } ], "standing": "Described in 97 Wikipedia languages, which measures how widely it is written about rather than how important or how common it is. 6 finer distinctions are held inside this entry as names rather than as separate models.", "structure": { "bundles": [ { "id": "identity-and-classification", "name": "Identity, naming and classification", "description": "How an agent tells one solstice from another, and a solstice from things that resemble it.", "rationale": "Recognition comes before every other claim. Without stable identity nothing else in the model can be trusted to be about the same thing twice.", "layers": [ { "id": "naming-and-identifiers", "name": "Names and identifiers", "description": "The names this thing goes by and the identifiers that survive translation and time.", "findings": [ { "id": "preferred-name-and-aliases", "name": "Preferred name, aliases and local names", "description": "Which name to use, which names mean the same thing, and which merely sound similar.", "questions": [ { "id": "preferred-name-and-aliases-q01", "text": "What identifies and describes the name of a solstice, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "preferred-name-and-aliases-q02", "text": "Who or what asserted this about the name of a solstice, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "preferred-name-and-aliases-q03", "text": "What may an agent decide or do once the name of a solstice is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] }, { "id": "stable-identifiers", "name": "Stable identifiers and external keys", "description": "Identifiers that keep pointing at this kind of thing across systems and languages.", "questions": [ { "id": "stable-identifiers-q01", "text": "What identifies and describes an identifier for a solstice, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "stable-identifiers-q02", "text": "Who or what asserted this about an identifier for a solstice, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "stable-identifiers-q03", "text": "What may an agent decide or do once an identifier for a solstice is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] } ] }, { "id": "classification-and-granularity", "name": "Classification and granularity", "description": "Where a solstice sits among kinds, and how finely a task needs to cut it.", "findings": [ { "id": "kind-and-parents", "name": "Kind, parents and neighbouring kinds", "description": "The classes this thing belongs to and the ones it is next to.", "questions": [ { "id": "kind-and-parents-q01", "text": "What identifies and describes the kind of a solstice, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "kind-and-parents-q02", "text": "Who or what asserted this about the kind of a solstice, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "kind-and-parents-q03", "text": "What may an agent decide or do once the kind of a solstice is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] }, { "id": "distinguishing-features", "name": "Distinguishing features", "description": "What separates a solstice from the things most often confused with it.", "questions": [ { "id": "distinguishing-features-q01", "text": "What identifies and describes what distinguishes a solstice, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "distinguishing-features-q02", "text": "Who or what asserted this about what distinguishes a solstice, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "distinguishing-features-q03", "text": "What may an agent decide or do once what distinguishes a solstice is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] } ] } ] }, { "id": "state-and-lifecycle", "name": "State and lifecycle", "description": "The states a solstice passes through and the events that move it between them.", "rationale": "Most decisions about a thing depend on what state it is in now, which is a claim with a time on it, not a property.", "layers": [ { "id": "lifecycle-stages", "name": "Lifecycle stages", "description": "From coming into existence to ceasing to be one of these.", "findings": [ { "id": "stages-and-transitions", "name": "Stages and transitions", "description": "The stages worth naming and what moves a solstice between them.", "questions": [ { "id": "stages-and-transitions-q01", "text": "What identifies and describes the lifecycle of a solstice, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "stages-and-transitions-q02", "text": "Who or what asserted this about the lifecycle of a solstice, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "stages-and-transitions-q03", "text": "What may an agent decide or do once the lifecycle of a solstice is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] } ] }, { "id": "observations-and-status", "name": "Observations and current status", "description": "What is observed about a solstice, how often and by whom.", "findings": [ { "id": "observation-record", "name": "Observation record", "description": "How an observation of a solstice is recorded so that it can be superseded rather than overwritten.", "questions": [ { "id": "observation-record-q01", "text": "What identifies and describes an observation of a solstice, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "observation-record-q02", "text": "Who or what asserted this about an observation of a solstice, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "observation-record-q03", "text": "What may an agent decide or do once an observation of a solstice is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] } ] } ] }, { "id": "definitions-in-contest", "name": "Definitions and who holds them", "description": "What solstice is taken to mean, and by whom.", "rationale": "When a field disagrees about a concept, the disagreement is the content. A model that picks one definition silently destroys the information.", "layers": [ { "id": "competing-definitions", "name": "Competing definitions", "description": "The main readings and the traditions behind them.", "findings": [ { "id": "definition-map", "name": "Definitions and their holders", "description": "Each definition with the school or body that holds it.", "questions": [ { "id": "definition-map-q01", "text": "Which definitions of solstice are in use, and which tradition or body holds each?", "kind": "definition" }, { "id": "definition-map-q02", "text": "What turns on the difference between them in practice?", "kind": "boundary" } ] } ] }, { "id": "operationalisation", "name": "Operationalisation", "description": "How it is measured or applied when it has to be.", "findings": [ { "id": "operational-record", "name": "Measures and proxies", "description": "Instruments and indicators used to stand in for it.", "questions": [ { "id": "operational-record-q01", "text": "How is solstice operationalised or measured in practice, and by what instrument?", "kind": "measurement" }, { "id": "operational-record-q02", "text": "What does that operationalisation leave out, and when does that matter?", "kind": "boundary" } ] } ] } ] }, { "id": "instances-and-use", "name": "Instances, use and consequence", "description": "What counts as an instance of solstice and what follows from calling something that.", "rationale": "Applying a concept is an act with consequences, so a model must say what the label licenses and what it does not.", "layers": [ { "id": "instances", "name": "What counts as an instance", "description": "Clear cases, borderline cases and non-cases.", "findings": [ { "id": "instance-tests", "name": "Tests for an instance", "description": "What would settle whether something falls under it.", "questions": [ { "id": "instance-tests-q01", "text": "What would settle whether something is an instance of solstice?", "kind": "boundary" }, { "id": "instance-tests-q02", "text": "Which borderline cases are argued about, and on what grounds?", "kind": "definition" } ] } ] }, { "id": "consequence", "name": "Consequence of application", "description": "Rights, duties or decisions that follow from the label.", "findings": [ { "id": "consequence-record", "name": "What the label licenses", "description": "What an agent may do once something is classified this way.", "questions": [ { "id": "consequence-record-q01", "text": "What follows practically once something is treated as solstice?", "kind": "action" }, { "id": "consequence-record-q02", "text": "What must an agent not infer from the label alone?", "kind": "action" } ] } ] } ] }, { "id": "provenance-and-evidence", "name": "Provenance, evidence and time", "description": "Where every claim about a solstice came from and when it held.", "rationale": "A claim without a source and a time cannot be superseded, only overwritten, and an agent that overwrites loses the ability to explain itself.", "layers": [ { "id": "source-and-authority", "name": "Source and authority", "description": "Who said it, on what evidence, and how strongly.", "findings": [ { "id": "claim-provenance", "name": "Claim provenance and confidence", "description": "The authority behind each claim about a solstice and how confident it is.", "questions": [ { "id": "claim-provenance-q01", "text": "What identifies and describes a claim about a solstice, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "claim-provenance-q02", "text": "Who or what asserted this about a claim about a solstice, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "claim-provenance-q03", "text": "What may an agent decide or do once a claim about a solstice is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] } ] }, { "id": "time-and-versions", "name": "Time, versions and supersession", "description": "When a claim was true, when it was learnt, and what replaced it.", "findings": [ { "id": "validity-and-supersession", "name": "Validity period and supersession", "description": "How an old claim about a solstice is retired without being erased.", "questions": [ { "id": "validity-and-supersession-q01", "text": "What identifies and describes the validity of a claim about a solstice, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "validity-and-supersession-q02", "text": "Who or what asserted this about the validity of a claim about a solstice, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "validity-and-supersession-q03", "text": "What may an agent decide or do once the validity of a claim about a solstice is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] } ] } ] } ] }, "statistics": { "bundles": 5, "layers": 10, "findings": 12, "questions": 32 } } } }