{"schema":"https://ver.cy/schemas/card/1.0.0","id":"vr.tr.september","code":"thing-q123","url":"https://ver.cy/models/thing/q123/","name":"September","alternateNames":[],"kind":"thing","status":"published","version":"0.2.0-wave.4","language":"en","classifiers":{"family":"Thing Registry","category":"Information and virtual systems","entryKind":"thing","plane":"INF","domain":["INF.KNW"],"industry":[],"navPath":"","tags":[],"facets":{}},"whatItIs":"The ninth month of the year in the Julian and Gregorian calendars, with 30 days, running from day 244 to day 273 in common years and from day 245 to day 274 in leap years, named from Latin septem, seven, because it was the seventh month of the early Roman calendar, containing the September equinox around 22 or 23 September, and observances such as Labor Day in the United States and Canada on the first Monday, Independence Day in Mexico on 16 September and the International Day of Peace on 21 September; in many countries the school year begins in September.","purpose":"Let an agent explain September as a calendar month, relay length, position, astronomy, etymology and common observances from calendar and cultural sources, and distinguish September from the September equinox, the September 11 attacks as an event and months in other calendars, noting that observances vary by country and year.","scope":{"in":[],"out":[],"boundaries":[]},"distinguishingFeatures":["Ninth month","Contains an equinox","Name from seventh Roman month","Start of school year in many countries"],"structure":{"bundles":[{"id":"understand","name":"Understand","description":"What September is.","layers":[{"id":"definition","name":"Definition","description":"Definition.","findings":[{"id":"definition-finding","name":"Definition","description":"Definition.","questions":[{"text":"What is September, and how does it relate to the September equinox, specific events and months in other calendars?","kind":"definition"},{"text":"Is the question about dates, seasons, holidays or etymology?","kind":"boundary"}]}]},{"id":"days","name":"Days","description":"Days of September.","findings":[{"id":"days-finding","name":"Days","description":"Days.","questions":[{"text":"Which days of September have entries, and what day-of-year numbers do they have?","kind":"measurement"},{"text":"Which entry fits the specific day?","kind":"action"}]}]}]},{"id":"astronomy","name":"Astronomy","description":"Astronomy and calendar.","layers":[{"id":"equinox","name":"Equinox","description":"Equinox.","findings":[{"id":"equinox-finding","name":"Equinox","description":"Equinox.","questions":[{"text":"Why does the September equinox fall around 22 or 23 September?","kind":"provenance"},{"text":"Which references are standard?","kind":"provenance"}]}]},{"id":"roman","name":"Roman","description":"Roman calendar.","findings":[{"id":"roman-finding","name":"Roman","description":"Roman.","questions":[{"text":"Why is September named for seven when it is the ninth month?","kind":"provenance"},{"text":"Which sources are cited?","kind":"provenance"}]}]}]},{"id":"culture","name":"Culture","description":"Observances.","layers":[{"id":"holidays","name":"Holidays","description":"Holidays.","findings":[{"id":"holidays-finding","name":"Holidays","description":"Holidays.","questions":[{"text":"Which holidays fall in September, such as Labor Day, Mexican Independence Day and the International Day of Peace?","kind":"provenance"},{"text":"Which entry fits International Day of Peace?","kind":"action"}]}]},{"id":"school","name":"School","description":"School year.","findings":[{"id":"school-finding","name":"School","description":"School.","questions":[{"text":"Why does the school year begin in September in many countries?","kind":"provenance"},{"text":"Which entry fits academic year?","kind":"action"}]}]}]},{"id":"context","name":"Context","description":"History.","layers":[{"id":"1752","name":"1752","description":"Calendar change of 1752.","findings":[{"id":"1752-finding","name":"1752","description":"1752.","questions":[{"text":"Why did September 1752 have eleven days removed in Britain and its colonies?","kind":"provenance"},{"text":"Which entry fits Calendar (New Style) Act 1750?","kind":"action"}]}]},{"id":"seasons","name":"Seasons","description":"Seasons.","findings":[{"id":"seasons-finding","name":"Seasons","description":"Seasons.","questions":[{"text":"How does September differ between hemispheres?","kind":"provenance"},{"text":"Which entry fits autumn?","kind":"action"}]}]}]}]},"agentConduct":{"may":["Compute dates and day numbers in September for the Gregorian or Julian calendar.","Explain why September, from Latin septem, is the ninth month."],"mustNot":["Assume September is autumn everywhere, ignoring the Southern Hemisphere spring.","State moveable observances, such as Labour Day in some countries, as fixed dates.","Equate the month with a single event that happened in it."],"requiresHuman":["Setting school or fiscal year dates that start in September across jurisdictions."]},"ethics":{"considerations":["Reducing a month to one tragedy, such as a terrorist attack, can wound people who lost relatives on other days or in other places."],"affectedParties":["Students and schools","People across hemispheres"]},"owners":{"steward":"Nobody owns it; it is part of the civil calendar.","roles":[],"masterSystems":[]},"relations":[{"target":"Q18602249","type":"parent","note":"registry parent class"},{"target":"month of the Gregorian calendar","type":"related","note":"in registry terms"},{"target":"August","type":"related"},{"target":"October","type":"related"},{"target":"September equinox","type":"contains"}],"interaction":{"identity":{"applicability":"required","items":["Vercy registry: vr.tr.september","Wikidata: Q123 (https://www.wikidata.org/wiki/Q123)"]},"properties":{"applicability":"not-applicable","items":["days: 30 count","day of year range: 244-273 in common years, 245-274 in leap years note","equinox: around 22 or 23 September date - varies by year and time zone","ISO 8601 number: 09 code"]},"recognition":{"applicability":"optional","items":["Ninth month of the Gregorian calendar","September, Sep, Sept","The September equinox is an astronomical event; September 11 is a specific date; other calendars differ","Not a visible object; a calendar period."]},"capabilities":{"applicability":"required","items":["explain position and length","relay astronomy and etymology","describe observances","distinguish related concepts"]},"hazards":{"applicability":"required","items":["Assuming Northern Hemisphere seasons","Stating moveable observances as fixed","Confusing the month with specific events"]},"interfaces":{"applicability":"required","items":["ISO 8601 date representation","National public holiday laws"]},"context":{"applicability":"required","items":["Organising time within the year.","days of September","September observances","September in different hemispheres"]}},"sources":[{"title":"Wikidata item Q123: September","url":"https://www.wikidata.org/wiki/Q123","note":"identity and sense of the item"},{"title":"Wikipedia: September","url":"https://en.wikipedia.org/wiki/September","note":"general description of the item"}],"openQuestions":["Should observances be linked individually?","How should calendar sources be linked?","How should moveable holidays be recorded?"],"resources":{"spec":"/models/things/publications/thing-q123/spec.json"},"provenance":{"origin":"thing registry research (pass 2)","builtFrom":["models/things/publications/thing-q123/spec.json"],"providers":["Claude"],"researchStatus":"unreviewed","generatedAt":"2026-09-13T22:05:38Z","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 2026-10-06T19:51:53+00:00: completeness 1.00; sense: Wikidata description; 2 live sources; review by codex: pass","interaction.properties":"Plane INF: no invented physical properties."},"score":1.0}}