Tonight's sky for a place

arazzo: 1.0.1
info:
  title: Tonight's sky for a place
  version: 1.0.0
  summary: >-
    Resolve a place name, take the whole-sky snapshot, then find the dark
    moonless observing window for the next week.
sourceDescriptions:
  - name: cyclecalcs
    url: ../openapi/cyclecalcs-astronomy-openapi-original.json
    type: openapi
workflows:
  - workflowId: tonightsSkyForAPlace
    summary: Place name to a usable observing plan in three keyless GETs.
    inputs:
      type: object
      required: [place]
      properties:
        place:
          type: string
          description: 'City or "City,CC" with an ISO country code, e.g. "Lisbon,PT".'
        nights:
          type: integer
          description: How many nights of dark window to rank (1-62).
    steps:
      - stepId: resolvePlace
        description: Resolve the place name to coordinates and an IANA timezone.
        operationId: getPlaces
        parameters:
          - name: q
            in: query
            value: $inputs.place
          - name: limit
            in: query
            value: 1
        successCriteria:
          - condition: $statusCode == 200
        outputs:
          lat: $response.body#/data/results/0/latitude
          lon: $response.body#/data/results/0/longitude
          tz: $response.body#/data/results/0/timezone
          attribution: $response.body#/attribution
      - stepId: skyToday
        description: One-call whole-sky snapshot for that place, right now.
        operationId: getToday
        parameters:
          - name: lat
            in: query
            value: $steps.resolvePlace.outputs.lat
          - name: lon
            in: query
            value: $steps.resolvePlace.outputs.lon
          - name: tz
            in: query
            value: $steps.resolvePlace.outputs.tz
        successCriteria:
          - condition: $statusCode == 200
        outputs:
          summary: $response.body#/data/summary
      - stepId: darkWindow
        description: The genuinely dark, moonless window per night, ranked.
        operationId: getDarkWindow
        parameters:
          - name: lat
            in: query
            value: $steps.resolvePlace.outputs.lat
          - name: lon
            in: query
            value: $steps.resolvePlace.outputs.lon
          - name: tz
            in: query
            value: $steps.resolvePlace.outputs.tz
          - name: nights
            in: query
            value: $inputs.nights
        successCriteria:
          - condition: $statusCode == 200
        outputs:
          nights: $response.body#/data
    outputs:
      summary: $steps.skyToday.outputs.summary
      darkNights: $steps.darkWindow.outputs.nights
      attribution: $steps.resolvePlace.outputs.attribution
x-generated: '2026-08-09'
x-method: generated
x-note: >-
  Every operationId is verbatim from the harvested OpenAPI. No key is required
  for any step; the free Basic tier serves all three. The `attribution` output
  is carried through deliberately — resolving a place puts a GeoNames CC BY 4.0
  credit obligation on the response.