{ "model": { "rank": 4465, "code": "thing-q37640", "model_id": "vr.tr.orbital-period", "name": "orbital period", "purpose": "Let an agent handle orbital periods by body, type of period, calculation and data sources.", "family": "Thing Registry", "category": "Cross-cutting context", "status": "research-draft", "kind": "thing", "plane": "XCT", "domain": "XCT.TME", "industry": "", "version": "", "url": "/models/thing/q37640/", "tier": 2, "score": 75, "payload": { "layer": "wikidata", "aliases": [ "solar year", "sidereal period", "synodic period" ], "aliasCount": 3, "merged": 3, "knownIn": 75, "facets": null, "markers": [], "lexicalClass": "", "senseRank": null, "alsoRegisteredAs": null, "source": { "dataset": "wikidata", "item": "Q37640", "url": "https://www.wikidata.org/wiki/Q37640", "license": "CC0 1.0" } }, "research": { "vercy": "1.0-draft", "publication": { "status": "research-draft", "adjudicationStatus": "unreviewed", "publishableCanonical": false, "generatedAt": "2026-09-11T08:36:00Z", "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": 1, "engine": "claude" }, "metaModel": { "id": "THING-Q37640", "registryId": "vr.tr.orbital-period", "name": "orbital period", "version": "0.2.0-wave.1", "entryKind": "thing", "family": "Thing Registry", "domain": [ "XCT.TME" ], "status": "research-draft" }, "canonicalUrl": "https://ver.cy/models/thing/q37640/", "model": { "registry_id": "vr.tr.orbital-period", "name": "orbital period", "purpose": "Let an agent handle orbital periods by body, type of period, calculation and data sources.", "definition": "The time a body takes to complete one orbit around another, measured as sidereal period (relative to the stars) or synodic period (relative to the Sun as seen from the primary); for Earth around the Sun, about one year.", "what_it_is_for": "Describing orbits of planets, moons, satellites and stars.", "affordances": [ "look up orbital periods", "compute periods with Kepler third law", "distinguish sidereal and synodic periods", "plan observations" ], "distinguishing_features": [ "Time for one orbit", "Depends on orbit size and masses", "Several definitions", "Computed from Kepler laws" ], "appearance": "Not visible; expressed as time for one orbit.", "visual_identification": [ "Sidereal and synodic periods", "Units such as days or years", "Satellite periods in minutes" ], "physical_properties": [ { "quantity": "Earth sidereal year", "typical_range": "about 365.256", "unit": "days", "note": "" }, { "quantity": "low Earth orbit period", "typical_range": "about 90", "unit": "minutes", "note": "" } ], "families_and_kinds": [ "sidereal period", "synodic period", "tropical and anomalistic years", "satellite orbital periods", "binary star periods" ], "related_models": [ { "relation": "is a kind of", "target": "period", "why": "category" }, { "relation": "is described by", "target": "Kepler laws", "why": "physics" }, { "relation": "applies to", "target": "planet, moon, satellite", "why": "bodies" }, { "relation": "is related to", "target": "orbit", "why": "path" } ], "identifiers": [], "standards_and_regulation": [ "IAU astronomical constants" ], "failure_modes_and_hazards": [ "Mixing sidereal and synodic periods", "Unit errors" ], "in_scope": [], "out_of_scope": [], "characteristics": [] }, "sources": [], "structure": { "bundles": [ { "id": "value", "name": "Value", "description": "How long.", "rationale": "Values need definitions.", "layers": [ { "id": "body", "name": "Body", "description": "Which orbit.", "findings": [ { "id": "body-finding", "name": "Body", "description": "Orbiting body.", "questions": [ { "text": "Which body and primary are concerned?", "kind": "definition" }, { "text": "What is the orbital period?", "kind": "measurement" } ] } ] }, { "id": "type", "name": "Type", "description": "Sidereal or synodic.", "findings": [ { "id": "type-finding", "name": "Type", "description": "Period type.", "questions": [ { "text": "Is the sidereal or synodic period meant?", "kind": "definition" }, { "text": "Why do they differ?", "kind": "definition" } ] } ] } ] }, { "id": "calculation", "name": "Calculation", "description": "Kepler third law.", "rationale": "Physics predicts periods.", "layers": [ { "id": "kepler", "name": "Kepler", "description": "Formula.", "findings": [ { "id": "kepler-finding", "name": "Kepler", "description": "Kepler third law.", "questions": [ { "text": "What period follows from this semi-major axis and mass?", "kind": "measurement" }, { "text": "Which approximations were made?", "kind": "boundary" } ] } ] }, { "id": "units", "name": "Units", "description": "Conversion.", "findings": [ { "id": "units-finding", "name": "Units", "description": "Units.", "questions": [ { "text": "In which units is the period given?", "kind": "definition" }, { "text": "How does it convert?", "kind": "measurement" } ] } ] } ] }, { "id": "data", "name": "Data", "description": "Sources.", "rationale": "Data should be sourced.", "layers": [ { "id": "ephemeris", "name": "Ephemeris", "description": "Reference data.", "findings": [ { "id": "ephemeris-finding", "name": "Ephemeris", "description": "Reference data.", "questions": [ { "text": "Which ephemeris or catalogue gives the value?", "kind": "provenance" }, { "text": "How precise is it?", "kind": "measurement" } ] } ] }, { "id": "satellites", "name": "Satellites", "description": "Artificial.", "findings": [ { "id": "satellites-finding", "name": "Satellites", "description": "Satellite periods.", "questions": [ { "text": "What is the satellite orbital period?", "kind": "measurement" }, { "text": "From which tracking data?", "kind": "provenance" } ] } ] } ] }, { "id": "use", "name": "Use", "description": "Applications.", "rationale": "Periods have uses.", "layers": [ { "id": "observing", "name": "Observing", "description": "Planning.", "findings": [ { "id": "observing-finding", "name": "Observing", "description": "Observation planning.", "questions": [ { "text": "When will the body next be well placed for observation?", "kind": "measurement" }, { "text": "How does the synodic period help?", "kind": "definition" } ] } ] }, { "id": "calendars", "name": "Calendars", "description": "Years.", "findings": [ { "id": "calendars-finding", "name": "Calendars", "description": "Calendar years.", "questions": [ { "text": "How does the orbital period relate to calendar years?", "kind": "definition" }, { "text": "Why are leap years needed?", "kind": "definition" } ] } ] } ] } ] }, "openQuestions": [ "Should period types be separate entries?", "How should ephemerides be linked?", "How should satellite data be linked?" ], "statistics": { "bundles": 4, "layers": 8, "findings": 8, "questions": 16 } }, "draft": { "generator": "vr.draft.v3", "status": "draft-generated", "researched": false, "archetype": "event or period", "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 orbital period, record what state it is in, and decide what may be done with it.", "whatItIs": "Let an agent handle orbital periods by body, type of period, calculation and data sources.", "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: solar year, sidereal period, synodic period.", "3 finer distinctions are held as aliases rather than separate entries, because telling them apart needs a task that asks for it.", "Described in 75 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 orbital period, 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": [ "Not a thing to see. Recognised by when it happened and who was involved, on the account of somebody." ], "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": [ "solar year", "sidereal period", "synodic period" ] } ], "standing": "Described in 75 Wikipedia languages, which measures how widely it is written about rather than how important or how common it is. 3 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 orbital period from another, and a orbital period 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 orbital period, 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 orbital period, 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 orbital period 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 orbital period, 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 orbital period, 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 orbital period 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 orbital period 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 orbital period, 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 orbital period, 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 orbital period 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 orbital period from the things most often confused with it.", "questions": [ { "id": "distinguishing-features-q01", "text": "What identifies and describes what distinguishes a orbital period, 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 orbital period, 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 orbital period 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 orbital period 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 orbital period between them.", "questions": [ { "id": "stages-and-transitions-q01", "text": "What identifies and describes the lifecycle of a orbital period, 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 orbital period, 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 orbital period 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 orbital period, how often and by whom.", "findings": [ { "id": "observation-record", "name": "Observation record", "description": "How an observation of a orbital period 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 orbital period, 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 orbital period, 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 orbital period is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] } ] } ] }, { "id": "extent-and-dating", "name": "Temporal extent and dating", "description": "When orbital period began and ended, and who says so.", "rationale": "Dates for events are conventions held by historiographies that disagree, and a single confident date hides the disagreement.", "layers": [ { "id": "dating", "name": "Dating and calendar", "description": "Start, end, granularity and the calendar used.", "findings": [ { "id": "date-record", "name": "Dates, granularity and authority", "description": "What is dated, how precisely, and on whose account.", "questions": [ { "id": "date-record-q01", "text": "What start and end are conventionally given for orbital period, at what granularity, in which calendar?", "kind": "definition" }, { "id": "date-record-q02", "text": "Which accounts date it differently, and on what grounds?", "kind": "provenance" } ] } ] }, { "id": "membership-of-the-event", "name": "What counts as part of it", "description": "Sub-events included or excluded, and by whom.", "findings": [ { "id": "inclusion", "name": "Inclusion and exclusion", "description": "The episodes treated as inside the event and those left out.", "questions": [ { "id": "inclusion-q01", "text": "Which episodes are counted as part of orbital period, and which are treated as separate?", "kind": "boundary" }, { "id": "inclusion-q02", "text": "Whose framing is being followed in that inclusion, and who frames it otherwise?", "kind": "provenance" } ] } ] } ] }, { "id": "participants-and-consequence", "name": "Participants, causes and consequences", "description": "Who took part in orbital period and what is claimed to follow from it.", "rationale": "Causation around events is asserted rather than observed, so each claim needs the party asserting it.", "layers": [ { "id": "participants", "name": "Participants and roles", "description": "Parties involved and what each did.", "findings": [ { "id": "participant-record", "name": "Parties and their roles", "description": "Who is recorded as involved and in what capacity.", "questions": [ { "id": "participant-record-q01", "text": "Which parties took part in orbital period, in what roles, and on whose account?", "kind": "provenance" }, { "id": "participant-record-q02", "text": "Where do accounts disagree about who was involved?", "kind": "boundary" } ] } ] }, { "id": "consequences", "name": "Causes and consequences", "description": "What is claimed to have caused it and followed from it.", "findings": [ { "id": "causal-claims", "name": "Causal claims and who makes them", "description": "Antecedents and outcomes as attributed claims.", "questions": [ { "id": "causal-claims-q01", "text": "What causes and consequences are attributed to orbital period, and by whom?", "kind": "provenance" }, { "id": "causal-claims-q02", "text": "What would an agent need before treating such a claim as settled rather than contested?", "kind": "action" } ] } ] } ] }, { "id": "provenance-and-evidence", "name": "Provenance, evidence and time", "description": "Where every claim about a orbital period 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 orbital period and how confident it is.", "questions": [ { "id": "claim-provenance-q01", "text": "What identifies and describes a claim about a orbital period, 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 orbital period, 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 orbital period 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 orbital period is retired without being erased.", "questions": [ { "id": "validity-and-supersession-q01", "text": "What identifies and describes the validity of a claim about a orbital period, 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 orbital period, 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 orbital period 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 } } } }