solstice
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.
Bundle → Layer → Finding → Questions Filled
4 bundles · 8 layers · 8 findings · 16 questions
Understand What a solstice is.
Definition
Definition and cause.
Definition
Definition.
- What is a solstice, and how does axial tilt cause it? definition
- Is the question about a solstice, an equinox or a meteorological season? boundary
Dates
Dates and timing.
Dates
Dates.
- When do the solstices occur, and why do the dates vary? measurement
- Which entry fits the specific solstice? action
Observe Observation.
Sky
Sun path and daylight.
Sky
Sky.
- How do the Sun path, sunrise points and daylight hours change at the solstices by latitude? provenance
- Which entry fits daylight? action
Planets
Solstices on other planets.
Planets
Planets.
- How do solstices work on Mars and other planets? provenance
- Which references are standard? provenance
Culture Culture and festivals.
Festivals
Festivals.
Festivals
Festivals.
- What solstice festivals exist, from midsummer and Yule to Dongzhi and Inti Raymi, with attribution? provenance
- Which entry fits the specific festival? action
Monuments
Ancient alignments.
Monuments
Monuments.
- What monuments align with the solstices, and what do archaeologists say about them? provenance
- Which sources are cited? provenance
Context History and calendars.
History
History of understanding.
History
History.
- How did ancient astronomers determine the solstices? provenance
- Which entry fits the history of astronomy? action
Calendars
Calendars.
Calendars
Calendars.
- How do calendars and season definitions use the solstices? provenance
- Which entry fits season? action
Classifiers Filled
- Family
- Thing Registry
- Category
- Cross-cutting context
- Entry kind
- thing
- Plane
- XCT
- Domain
- XCT.QLT
- Other names and narrower kinds
- Mars southern solstice, winter solstice, December solstice, June solstice, summer solstice, Blue Christmas
What it is Filled
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.
Why it exists Filled
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.
Distinguishing features Filled
- Extreme day length
- Axial tilt cause
- Hemisphere reversal
- Cultural festivals
What robots and AI may and may not do Filled
Must not
- Confuse the solstice instant with a whole day or with the seasonal temperature extremes.
- Attach astrological predictions to a solstice and present them as science.
- Misrepresent the solstice festivals of a culture or appropriate their rituals commercially.
Only with a human decision
- Publishing content about ceremonies at sacred solstice sites.
May
- Compute solstice times for a location and explain the astronomy.
- Use solstice dates for calendars, daylight planning and solar modelling.
Moral aspects Filled
- Solstice observances are sacred in many traditions, including Indigenous ones.
- Pseudoscience attached to astronomical events misleads the public.
Who is affected
- Communities with solstice traditions
- Visitors to heritage sites
- The public
Owners Filled
Steward
Nobody owns an astronomical event; national observatories publish the times.
Master systems
- National almanacs and ephemerides
Links to other meta-models Filled
parent
- Q11483816 - registry parent class
- Q751989 - registry parent class
- Q845060 - registry parent class
related
- astronomical phenomenon - in registry terms
- annual event - in registry terms
- maxima and minima - in registry terms
- equinox - the midpoint events
What else AI and robots need to interact with it Filled
Identity and identifiers required Filled
- Vercy registry: vr.tr.solstice
- Wikidata: Q123524 (https://www.wikidata.org/wiki/Q123524)
Direct properties not applicable Not applicable
- axial tilt of Earth: 23.44 degrees
- June solstice date: 20-22 June
- December solstice date: 20-23 December
Plane XCT: no invented physical properties.
Recognition optional Filled
- 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
- Not a visible object; the Sun at its extreme rising and setting points.
Capabilities and actions required Filled
- explain the astronomy
- relay dates and variations
- describe cultural observances
- distinguish from equinoxes
Hazards and failure modes required Filled
- Confusing solstice with equinox
- Assuming the solstice is the hottest or coldest day
- Wrong dates by hemisphere
Standards and interfaces required Filled
- No regulation; astronomical almanacs define the times
Context of use required Filled
- Not applicable; an astronomical event.
- 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
Sources Filled
- Wikidata item Q123524: solstice - identity and sense of the item
- Wikipedia: Solstice - general description of the item
Open questions
- 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?
Machine files
Provenance
thing registry research (pass 2) · unreviewed
Built from: models/things/publications/thing-q123524/spec.json