{ "openapi": "3.1.1", "info": { "title": "Skyfold Star Map Poster API", "version": "1.0.0", "summary": "Print the real night sky of any place and moment as an SVG or PDF poster.", "description": "Every endpoint performs the same calculation as the human page and returns inputs, result, units, assumptions, sources, warnings and computedAt. MCP endpoint: /mcp." }, "servers": [ { "url": "https://skyfoldstarmapposter.usefulweb.app" } ], "paths": { "/api/v1/calculate": { "post": { "operationId": "calculate", "summary": "Print the real night sky of any place and moment as an SVG or PDF poster.", "description": "Draws the stars to magnitude 6.5, constellation figures, the Moon and planets exactly as they stood above a place at a local date and time, in five print styles and seven paper sizes, as a vector SVG and PDF.\n\nMethodology:\n- Stars: every HYG v4.1 star to magnitude 6.5 (8 920 stars), precessed from J2000 to the date with nutation and annual aberration, then converted to azimuth and altitude with refraction.\n- Projection: zenithal stereographic, zenith in the centre and the horizon as the circle, north up and east on the left as seen when you look up.\n- Constellation figures from d3-celestial (BSD licence); Moon and planets from the Skyfold ephemeris. Dot sizes grow by a factor 1.38 per magnitude.\n- Vector output: the SVG and a one-page PDF at the paper size (standard PDF fonts).\n\nShows the geometric sky without clouds, light pollution or the Milky Way band; proper motions of stars are not applied. Texts outside the Latin-1 character set are replaced in the PDF (use the SVG instead).", "tags": [ "apps" ], "x-mcp-tool": "skyfold_star_map_poster", "x-owner-app": "skyfold", "requestBody": { "required": true, "content": { "application/json": { "schema": { "$ref": "#/components/schemas/SkyfoldStarMapPosterInput" }, "examples": { "example1": { "summary": "Paris, 14 June 2019, ivory print", "value": { "location": "48.8566, 2.3522", "timeZone": "Europe/Paris", "date": "2019-06-14", "time": "23:30", "style": "ivory", "size": "a3", "magLimit": 6, "title": "The night we met", "placeLabel": "Paris, France" } }, "example2": { "summary": "Tokyo New Year sky, black and gold", "value": { "location": "35.6762, 139.6503", "timeZone": "Asia/Tokyo", "date": "2027-01-01", "time": "00:00", "style": "black", "size": "square", "magLimit": 5.5, "title": "A new year begins", "placeLabel": "Tokyo", "starNames": true } } } } } }, "responses": { "200": { "description": "Calculation result envelope.", "content": { "application/json": { "schema": { "$ref": "#/components/schemas/SkyfoldStarMapPosterResult" } } } }, "400": { "description": "Malformed JSON body.", "content": { "application/problem+json": { "schema": { "$ref": "#/components/schemas/Problem" } } } }, "422": { "description": "Invalid input (see errors[]).", "content": { "application/problem+json": { "schema": { "$ref": "#/components/schemas/Problem" } } } }, "429": { "description": "Rate limit exceeded (see Retry-After).", "content": { "application/problem+json": { "schema": { "$ref": "#/components/schemas/Problem" } } } } } } }, "/api/v1/tool": { "get": { "operationId": "getToolDefinition", "summary": "Inputs, output schema and examples for this tool", "responses": { "200": { "description": "Tool definition.", "content": { "application/json": { "schema": { "type": "object" } } } } } } } }, "components": { "schemas": { "Problem": { "type": "object", "description": "RFC 9457 problem details. 422 responses include per-field `errors`.", "required": [ "type", "title", "status", "detail" ], "properties": { "type": { "type": "string" }, "title": { "type": "string" }, "status": { "type": "integer" }, "detail": { "type": "string" }, "code": { "type": "string" }, "errors": { "type": "array", "items": { "type": "object", "required": [ "field", "message" ], "properties": { "field": { "type": "string" }, "message": { "type": "string" } } } } } }, "SkyfoldStarMapPosterInput": { "type": "object", "additionalProperties": false, "properties": { "location": { "title": "Location (latitude, longitude)", "description": "Decimal degrees such as 52.09, 5.12 (north and east positive), or DMS, UTM, MGRS, Maidenhead or a plus code.", "type": "string", "maxLength": 80, "default": "48.8566, 2.3522" }, "elevation": { "title": "Elevation above sea level", "type": "number", "minimum": -500, "maximum": 9000, "default": 0, "x-unit": "m" }, "timeZone": { "title": "Time zone", "description": "IANA name such as Europe/Berlin or America/New_York, or a fixed offset such as UTC+2.", "type": "string", "maxLength": 64, "default": "Europe/Paris" }, "date": { "title": "Local date", "type": "string", "format": "date", "default": "2019-06-14" }, "time": { "title": "Local time", "type": "string", "pattern": "^([01]\\d|2[0-3]):[0-5]\\d$", "default": "23:30" }, "style": { "title": "Style", "type": "string", "enum": [ "midnight", "ivory", "black", "blueprint", "red" ], "default": "midnight" }, "size": { "title": "Paper size", "type": "string", "enum": [ "a4", "a3", "a2", "letter", "in12x16", "in18x24", "square" ], "default": "a3" }, "magLimit": { "title": "Faintest stars (magnitude)", "description": "Larger numbers show fainter stars; 6 to 6.5 is the naked-eye limit under a dark sky.", "type": "number", "minimum": 3, "maximum": 6.5, "default": 6 }, "title": { "title": "Title", "type": "string", "maxLength": 120, "default": "The night we met" }, "subtitle": { "title": "Subtitle", "type": "string", "maxLength": 120, "default": "" }, "placeLabel": { "title": "Place line", "type": "string", "maxLength": 120, "default": "Paris, France" }, "dateLabel": { "title": "Date line", "description": "Leave blank to print the local date and time.", "type": "string", "maxLength": 120, "default": "" }, "constellations": { "title": "Constellation lines", "type": "boolean", "default": true }, "constellationNames": { "title": "Constellation names", "type": "boolean", "default": true }, "starNames": { "title": "Names of the brightest stars", "type": "boolean", "default": false }, "planets": { "title": "Moon and planets", "type": "boolean", "default": true }, "colorStars": { "title": "Star colours from the B−V index", "type": "boolean", "default": false } }, "required": [] }, "SkyfoldStarMapPosterResult": { "type": "object", "additionalProperties": false, "required": [ "schemaVersion", "tool", "computedAt", "inputs", "summary", "result", "units", "assumptions", "sources", "warnings", "presentation", "links" ], "properties": { "schemaVersion": { "type": "string", "const": "1.0" }, "tool": { "type": "object", "additionalProperties": false, "required": [ "id", "name", "version" ], "properties": { "id": { "type": "string" }, "name": { "type": "string" }, "version": { "type": "string" } } }, "computedAt": { "type": "string", "format": "date-time" }, "inputs": { "type": "object", "description": "Normalised inputs actually used, including applied defaults." }, "summary": { "type": "string" }, "result": { "type": "object" }, "units": { "type": "object", "additionalProperties": { "type": "string" } }, "assumptions": { "type": "array", "items": { "type": "string" } }, "sources": { "type": "array", "items": { "type": "object", "additionalProperties": false, "required": [ "title" ], "properties": { "title": { "type": "string" }, "url": { "type": "string" }, "publisher": { "type": "string" }, "retrievedAt": { "type": "string" }, "note": { "type": "string" } } } }, "warnings": { "type": "array", "items": { "type": "string" } }, "presentation": { "type": "array", "items": { "type": "object" }, "description": "Display blocks used by the human page (same data)." }, "links": { "type": "object", "additionalProperties": false, "required": [ "human", "api", "openapi", "methodology" ], "properties": { "human": { "type": "string", "format": "uri" }, "api": { "type": "string", "format": "uri" }, "openapi": { "type": "string", "format": "uri" }, "methodology": { "type": "string", "format": "uri" } } } } } } } }