{
  "openapi": "3.1.0",
  "info": {
    "title": "CalculationTime API",
    "version": "0.1.0",
    "description": "Reliable time, date, holiday, geospatial, solar, astronomy, and utility calculations with explicit trust fields and API-key protection where required."
  },
  "servers": [
    {
      "url": "https://api.calculationtime.com"
    },
    {
      "url": "http://127.0.0.1:4110"
    }
  ],
  "paths": {
    "/": {
      "get": {
        "summary": "Markdown API documentation",
        "responses": {
          "200": {
            "description": "Markdown API overview"
          }
        },
        "security": []
      }
    },
    "/health": {
      "get": {
        "summary": "Low-level service health",
        "responses": {
          "200": {
            "description": "Healthy service state"
          }
        },
        "security": []
      }
    },
    "/openapi.json": {
      "get": {
        "summary": "OpenAPI contract for live v1 routes",
        "responses": {
          "200": {
            "description": "OpenAPI 3.1 JSON document"
          }
        },
        "security": []
      }
    },
    "/v1/time/utc": {
      "get": {
        "summary": "Current UTC timestamp and clock-model metadata",
        "responses": {
          "200": {
            "description": "Current UTC timestamp, Unix values, source, and measured-status wording without SLA claim"
          }
        },
        "security": []
      }
    },
    "/v1/status": {
      "get": {
        "summary": "Public measured service status and endpoint inventory",
        "responses": {
          "200": {
            "description": "Service status, route families, uptime, monitoring routes, and no-SLA wording"
          }
        },
        "security": []
      }
    },
    "/api/v1/utility/tagline": {
      "get": {
        "summary": "Deterministic daily CalculationTime tagline",
        "responses": {
          "200": {
            "description": "Daily UTC-seeded tagline"
          }
        },
        "security": []
      }
    },
    "/v1/canary": {
      "get": {
        "summary": "Protected monitoring canary for API-key path checks",
        "responses": {
          "200": {
            "description": "Protected canary response"
          },
          "400": {
            "description": "Invalid request input"
          },
          "401": {
            "description": "A valid API key is required"
          },
          "429": {
            "description": "Rate limit exceeded"
          }
        },
        "security": [
          {
            "ApiKeyAuth": []
          },
          {
            "BearerAuth": []
          }
        ]
      }
    },
    "/v1/time": {
      "get": {
        "summary": "Get local time for one coordinate",
        "responses": {
          "200": {
            "description": "Successful response"
          },
          "400": {
            "description": "Invalid request input"
          },
          "401": {
            "description": "A valid API key is required"
          },
          "429": {
            "description": "Rate limit exceeded"
          }
        },
        "parameters": [
          {
            "name": "lat",
            "in": "query",
            "required": true,
            "schema": {
              "type": "number",
              "minimum": -90,
              "maximum": 90
            },
            "description": "Latitude in decimal degrees."
          },
          {
            "name": "lon",
            "in": "query",
            "required": true,
            "schema": {
              "type": "number",
              "minimum": -180,
              "maximum": 180
            },
            "description": "Longitude in decimal degrees."
          },
          {
            "name": "at",
            "in": "query",
            "required": false,
            "schema": {
              "type": "string"
            },
            "description": "Optional ISO-8601 timestamp, epoch seconds, or epoch milliseconds. Defaults to now."
          }
        ],
        "security": [
          {
            "ApiKeyAuth": []
          },
          {
            "BearerAuth": []
          }
        ]
      }
    },
    "/v1/time/batch": {
      "post": {
        "summary": "Get local time for up to 100 coordinates",
        "responses": {
          "200": {
            "description": "Successful response"
          },
          "400": {
            "description": "Invalid request input"
          },
          "401": {
            "description": "A valid API key is required"
          },
          "429": {
            "description": "Rate limit exceeded"
          }
        },
        "requestBody": {
          "required": true,
          "content": {
            "application/json": {
              "schema": {
                "type": "object",
                "required": [
                  "points"
                ],
                "properties": {
                  "at": {
                    "type": "string"
                  },
                  "points": {
                    "type": "array",
                    "minItems": 1,
                    "maxItems": 100,
                    "items": {
                      "type": "object",
                      "required": [
                        "lat",
                        "lon"
                      ],
                      "properties": {
                        "lat": {
                          "type": "number",
                          "minimum": -90,
                          "maximum": 90
                        },
                        "lon": {
                          "type": "number",
                          "minimum": -180,
                          "maximum": 180
                        },
                        "at": {
                          "type": "string"
                        }
                      }
                    }
                  }
                }
              },
              "example": {
                "at": "2026-07-29T12:00:00Z",
                "points": [
                  {
                    "lat": 48.137154,
                    "lon": 11.576124
                  }
                ]
              }
            }
          }
        },
        "security": [
          {
            "ApiKeyAuth": []
          },
          {
            "BearerAuth": []
          }
        ]
      }
    },
    "/v1/date/difference": {
      "get": {
        "summary": "Calendar day difference",
        "responses": {
          "200": {
            "description": "Successful response"
          },
          "400": {
            "description": "Invalid request input"
          },
          "401": {
            "description": "A valid API key is required"
          },
          "429": {
            "description": "Rate limit exceeded"
          }
        },
        "parameters": [
          {
            "name": "start",
            "in": "query",
            "required": true,
            "schema": {
              "type": "string"
            }
          },
          {
            "name": "end",
            "in": "query",
            "required": true,
            "schema": {
              "type": "string"
            }
          }
        ],
        "security": [
          {
            "ApiKeyAuth": []
          },
          {
            "BearerAuth": []
          }
        ]
      }
    },
    "/v1/date/difference/batch": {
      "post": {
        "summary": "Batch calendar day differences",
        "responses": {
          "200": {
            "description": "Successful response"
          },
          "400": {
            "description": "Invalid request input"
          },
          "401": {
            "description": "A valid API key is required"
          },
          "429": {
            "description": "Rate limit exceeded"
          }
        },
        "requestBody": {
          "required": true,
          "content": {
            "application/json": {
              "schema": {
                "type": "object",
                "required": [
                  "ranges"
                ],
                "properties": {
                  "ranges": {
                    "type": "array",
                    "minItems": 1,
                    "maxItems": 1000,
                    "items": {
                      "type": "object",
                      "required": [
                        "start",
                        "end"
                      ],
                      "properties": {
                        "start": {
                          "type": "string"
                        },
                        "end": {
                          "type": "string"
                        }
                      }
                    }
                  }
                }
              },
              "example": {
                "ranges": [
                  {
                    "start": "2026-07-12",
                    "end": "2026-08-01"
                  }
                ]
              }
            }
          }
        },
        "security": [
          {
            "ApiKeyAuth": []
          },
          {
            "BearerAuth": []
          }
        ]
      }
    },
    "/v1/date/add": {
      "get": {
        "summary": "Add years, months, weeks, and days to a date",
        "responses": {
          "200": {
            "description": "Successful response"
          },
          "400": {
            "description": "Invalid request input"
          },
          "401": {
            "description": "A valid API key is required"
          },
          "429": {
            "description": "Rate limit exceeded"
          }
        },
        "parameters": [
          {
            "name": "start",
            "in": "query",
            "required": true,
            "schema": {
              "type": "string"
            }
          },
          {
            "name": "years",
            "in": "query",
            "required": false,
            "schema": {
              "type": "integer"
            }
          },
          {
            "name": "months",
            "in": "query",
            "required": false,
            "schema": {
              "type": "integer"
            }
          },
          {
            "name": "weeks",
            "in": "query",
            "required": false,
            "schema": {
              "type": "integer"
            }
          },
          {
            "name": "days",
            "in": "query",
            "required": false,
            "schema": {
              "type": "integer"
            }
          }
        ],
        "security": [
          {
            "ApiKeyAuth": []
          },
          {
            "BearerAuth": []
          }
        ]
      }
    },
    "/v1/date/business-days": {
      "post": {
        "summary": "Business days between dates with optional supplied holidays",
        "responses": {
          "200": {
            "description": "Successful response"
          },
          "400": {
            "description": "Invalid request input"
          },
          "401": {
            "description": "A valid API key is required"
          },
          "429": {
            "description": "Rate limit exceeded"
          }
        },
        "requestBody": {
          "required": true,
          "content": {
            "application/json": {
              "schema": {
                "type": "object",
                "required": [
                  "start",
                  "end"
                ],
                "properties": {
                  "start": {
                    "type": "string"
                  },
                  "end": {
                    "type": "string"
                  },
                  "holidays": {
                    "type": "array",
                    "items": {
                      "type": "string"
                    }
                  }
                }
              },
              "example": {
                "start": "2026-07-12",
                "end": "2026-07-31",
                "holidays": [
                  "2026-07-20"
                ]
              }
            }
          }
        },
        "security": [
          {
            "ApiKeyAuth": []
          },
          {
            "BearerAuth": []
          }
        ]
      }
    },
    "/v1/date/business-days/jurisdiction": {
      "post": {
        "summary": "Business days using beta jurisdiction holiday rules",
        "responses": {
          "200": {
            "description": "Successful response"
          },
          "400": {
            "description": "Invalid request input"
          },
          "401": {
            "description": "A valid API key is required"
          },
          "429": {
            "description": "Rate limit exceeded"
          }
        },
        "requestBody": {
          "required": true,
          "content": {
            "application/json": {
              "schema": {
                "type": "object",
                "required": [
                  "country",
                  "start",
                  "end"
                ],
                "properties": {
                  "country": {
                    "type": "string",
                    "enum": [
                      "US",
                      "USA",
                      "UK",
                      "GB",
                      "GB-ENG",
                      "GB-WLS",
                      "AU",
                      "AUS"
                    ]
                  },
                  "start": {
                    "type": "string"
                  },
                  "end": {
                    "type": "string"
                  }
                }
              },
              "example": {
                "country": "UK",
                "start": "2026-12-24",
                "end": "2026-12-29"
              }
            }
          }
        },
        "security": [
          {
            "ApiKeyAuth": []
          },
          {
            "BearerAuth": []
          }
        ]
      }
    },
    "/v1/holidays": {
      "get": {
        "summary": "List beta public holidays for a supported jurisdiction and year",
        "responses": {
          "200": {
            "description": "Successful response"
          },
          "400": {
            "description": "Invalid request input"
          },
          "401": {
            "description": "A valid API key is required"
          },
          "429": {
            "description": "Rate limit exceeded"
          }
        },
        "parameters": [
          {
            "name": "country",
            "in": "query",
            "required": true,
            "schema": {
              "type": "string"
            }
          },
          {
            "name": "year",
            "in": "query",
            "required": true,
            "schema": {
              "type": "integer",
              "minimum": 1900,
              "maximum": 2100
            }
          }
        ],
        "security": [
          {
            "ApiKeyAuth": []
          },
          {
            "BearerAuth": []
          }
        ]
      }
    },
    "/v1/holidays/next": {
      "get": {
        "summary": "Find next beta public holiday for a jurisdiction",
        "responses": {
          "200": {
            "description": "Successful response"
          },
          "400": {
            "description": "Invalid request input"
          },
          "401": {
            "description": "A valid API key is required"
          },
          "429": {
            "description": "Rate limit exceeded"
          }
        },
        "parameters": [
          {
            "name": "country",
            "in": "query",
            "required": true,
            "schema": {
              "type": "string"
            }
          },
          {
            "name": "from",
            "in": "query",
            "required": false,
            "schema": {
              "type": "string"
            }
          }
        ],
        "security": [
          {
            "ApiKeyAuth": []
          },
          {
            "BearerAuth": []
          }
        ]
      }
    },
    "/v1/holidays/is-business-day": {
      "get": {
        "summary": "Check whether a date is a business day in a beta jurisdiction",
        "responses": {
          "200": {
            "description": "Successful response"
          },
          "400": {
            "description": "Invalid request input"
          },
          "401": {
            "description": "A valid API key is required"
          },
          "429": {
            "description": "Rate limit exceeded"
          }
        },
        "parameters": [
          {
            "name": "country",
            "in": "query",
            "required": true,
            "schema": {
              "type": "string"
            }
          },
          {
            "name": "date",
            "in": "query",
            "required": true,
            "schema": {
              "type": "string"
            }
          }
        ],
        "security": [
          {
            "ApiKeyAuth": []
          },
          {
            "BearerAuth": []
          }
        ]
      }
    },
    "/v1/geo/distance": {
      "get": {
        "summary": "Distance and initial bearing between two coordinates",
        "responses": {
          "200": {
            "description": "Successful response"
          },
          "400": {
            "description": "Invalid request input"
          },
          "401": {
            "description": "A valid API key is required"
          },
          "429": {
            "description": "Rate limit exceeded"
          }
        },
        "parameters": [
          {
            "name": "from_lat",
            "in": "query",
            "required": true,
            "schema": {
              "type": "number"
            }
          },
          {
            "name": "from_lon",
            "in": "query",
            "required": true,
            "schema": {
              "type": "number"
            }
          },
          {
            "name": "to_lat",
            "in": "query",
            "required": true,
            "schema": {
              "type": "number"
            }
          },
          {
            "name": "to_lon",
            "in": "query",
            "required": true,
            "schema": {
              "type": "number"
            }
          }
        ],
        "security": [
          {
            "ApiKeyAuth": []
          },
          {
            "BearerAuth": []
          }
        ]
      }
    },
    "/v1/geo/distance/batch": {
      "post": {
        "summary": "Batch distance and initial bearing calculations",
        "responses": {
          "200": {
            "description": "Successful response"
          },
          "400": {
            "description": "Invalid request input"
          },
          "401": {
            "description": "A valid API key is required"
          },
          "429": {
            "description": "Rate limit exceeded"
          }
        },
        "requestBody": {
          "required": true,
          "content": {
            "application/json": {
              "schema": {
                "type": "object",
                "required": [
                  "pairs"
                ],
                "properties": {
                  "pairs": {
                    "type": "array",
                    "minItems": 1,
                    "maxItems": 500,
                    "items": {
                      "type": "object",
                      "required": [
                        "from_lat",
                        "from_lon",
                        "to_lat",
                        "to_lon"
                      ],
                      "properties": {
                        "from_lat": {
                          "type": "number"
                        },
                        "from_lon": {
                          "type": "number"
                        },
                        "to_lat": {
                          "type": "number"
                        },
                        "to_lon": {
                          "type": "number"
                        }
                      }
                    }
                  }
                }
              },
              "example": {
                "pairs": [
                  {
                    "from_lat": 48.137154,
                    "from_lon": 11.576124,
                    "to_lat": 52.52,
                    "to_lon": 13.405
                  }
                ]
              }
            }
          }
        },
        "security": [
          {
            "ApiKeyAuth": []
          },
          {
            "BearerAuth": []
          }
        ]
      }
    },
    "/v1/geo/midpoint": {
      "get": {
        "summary": "Great-circle midpoint between two coordinates",
        "responses": {
          "200": {
            "description": "Successful response"
          },
          "400": {
            "description": "Invalid request input"
          },
          "401": {
            "description": "A valid API key is required"
          },
          "429": {
            "description": "Rate limit exceeded"
          }
        },
        "parameters": [
          {
            "name": "from_lat",
            "in": "query",
            "required": true,
            "schema": {
              "type": "number"
            }
          },
          {
            "name": "from_lon",
            "in": "query",
            "required": true,
            "schema": {
              "type": "number"
            }
          },
          {
            "name": "to_lat",
            "in": "query",
            "required": true,
            "schema": {
              "type": "number"
            }
          },
          {
            "name": "to_lon",
            "in": "query",
            "required": true,
            "schema": {
              "type": "number"
            }
          }
        ],
        "security": [
          {
            "ApiKeyAuth": []
          },
          {
            "BearerAuth": []
          }
        ]
      }
    },
    "/v1/geo/bounding-box": {
      "get": {
        "summary": "Approximate spherical bounding box around a coordinate and radius",
        "responses": {
          "200": {
            "description": "Successful response"
          },
          "400": {
            "description": "Invalid request input"
          },
          "401": {
            "description": "A valid API key is required"
          },
          "429": {
            "description": "Rate limit exceeded"
          }
        },
        "parameters": [
          {
            "name": "lat",
            "in": "query",
            "required": true,
            "schema": {
              "type": "number",
              "minimum": -90,
              "maximum": 90
            },
            "description": "Latitude in decimal degrees."
          },
          {
            "name": "lon",
            "in": "query",
            "required": true,
            "schema": {
              "type": "number",
              "minimum": -180,
              "maximum": 180
            },
            "description": "Longitude in decimal degrees."
          },
          {
            "name": "radius_km",
            "in": "query",
            "required": true,
            "schema": {
              "type": "number",
              "exclusiveMinimum": 0
            }
          }
        ],
        "security": [
          {
            "ApiKeyAuth": []
          },
          {
            "BearerAuth": []
          }
        ]
      }
    },
    "/v1/geo/elevation": {
      "get": {
        "summary": "Terrain elevation for one coordinate using Open-Meteo/Copernicus DEM GLO-90",
        "responses": {
          "200": {
            "description": "Successful response"
          },
          "400": {
            "description": "Invalid request input"
          },
          "401": {
            "description": "A valid API key is required"
          },
          "429": {
            "description": "Rate limit exceeded"
          }
        },
        "parameters": [
          {
            "name": "lat",
            "in": "query",
            "required": true,
            "schema": {
              "type": "number",
              "minimum": -90,
              "maximum": 90
            },
            "description": "Latitude in decimal degrees."
          },
          {
            "name": "lon",
            "in": "query",
            "required": true,
            "schema": {
              "type": "number",
              "minimum": -180,
              "maximum": 180
            },
            "description": "Longitude in decimal degrees."
          }
        ],
        "security": [
          {
            "ApiKeyAuth": []
          },
          {
            "BearerAuth": []
          }
        ]
      }
    },
    "/v1/geo/nearby": {
      "get": {
        "summary": "Find stored geo points inside a radius",
        "responses": {
          "200": {
            "description": "Successful response"
          },
          "400": {
            "description": "Invalid request input"
          },
          "401": {
            "description": "A valid API key is required"
          },
          "429": {
            "description": "Rate limit exceeded"
          }
        },
        "parameters": [
          {
            "name": "lat",
            "in": "query",
            "required": true,
            "schema": {
              "type": "number",
              "minimum": -90,
              "maximum": 90
            },
            "description": "Latitude in decimal degrees."
          },
          {
            "name": "lon",
            "in": "query",
            "required": true,
            "schema": {
              "type": "number",
              "minimum": -180,
              "maximum": 180
            },
            "description": "Longitude in decimal degrees."
          },
          {
            "name": "radius_km",
            "in": "query",
            "required": true,
            "schema": {
              "type": "number",
              "exclusiveMinimum": 0
            }
          },
          {
            "name": "limit",
            "in": "query",
            "required": false,
            "schema": {
              "type": "integer",
              "minimum": 1,
              "maximum": 500
            }
          },
          {
            "name": "source",
            "in": "query",
            "required": false,
            "schema": {
              "type": "string"
            }
          },
          {
            "name": "category",
            "in": "query",
            "required": false,
            "schema": {
              "type": "string"
            }
          }
        ],
        "security": [
          {
            "ApiKeyAuth": []
          },
          {
            "BearerAuth": []
          }
        ]
      }
    },
    "/v1/solar/position": {
      "get": {
        "summary": "Solar azimuth, elevation, daylight state, and NOAA-style geometry for a coordinate and UTC timestamp",
        "responses": {
          "200": {
            "description": "Successful response"
          },
          "400": {
            "description": "Invalid request input"
          },
          "401": {
            "description": "A valid API key is required"
          },
          "429": {
            "description": "Rate limit exceeded"
          }
        },
        "parameters": [
          {
            "name": "lat",
            "in": "query",
            "required": true,
            "schema": {
              "type": "number",
              "minimum": -90,
              "maximum": 90
            },
            "description": "Latitude in decimal degrees."
          },
          {
            "name": "lon",
            "in": "query",
            "required": true,
            "schema": {
              "type": "number",
              "minimum": -180,
              "maximum": 180
            },
            "description": "Longitude in decimal degrees."
          },
          {
            "name": "at",
            "in": "query",
            "required": true,
            "schema": {
              "type": "string"
            }
          }
        ],
        "security": [
          {
            "ApiKeyAuth": []
          },
          {
            "BearerAuth": []
          }
        ]
      }
    },
    "/v1/astronomy/ephemeris": {
      "get": {
        "summary": "Geocentric and heliocentric ephemeris telemetry for Sun, Moon, and planets",
        "responses": {
          "200": {
            "description": "Successful response"
          },
          "400": {
            "description": "Invalid request input"
          },
          "401": {
            "description": "A valid API key is required"
          },
          "429": {
            "description": "Rate limit exceeded"
          }
        },
        "parameters": [
          {
            "name": "date",
            "in": "query",
            "required": true,
            "schema": {
              "type": "string"
            },
            "description": "ISO date or timestamp from 1900-01-01 through 2100-12-31."
          }
        ],
        "security": [
          {
            "ApiKeyAuth": []
          },
          {
            "BearerAuth": []
          }
        ]
      }
    }
  },
  "components": {
    "securitySchemes": {
      "ApiKeyAuth": {
        "type": "apiKey",
        "in": "header",
        "name": "X-API-Key"
      },
      "BearerAuth": {
        "type": "http",
        "scheme": "bearer"
      }
    }
  }
}