Moon Phase Dates: New, Quarter and Full Moon Times (USNO)

usno/moon-phases

The dates and Universal Time of the next 1 to 99 primary moon phases (new moon, first quarter, full moon, last quarter) from a start date between 1700 and 2100, as computed by the U.S. Naval Observatory. Returns the phase name and its year, month, day and time. Astronomical computation data passed through unmodified and served by Eden Engine; not an official U.S. Naval Observatory product.

activeper callv1

Price

$0.0026 per call

You pay the price shown. If a call turns out to cost more than its quote, you pay the actual price, capped at twice the quote. No monthly minimum. Top-ups start at $5.

Data source

U.S. Naval Observatory

Data from the U.S. Naval Observatory (USNO), U.S. Department of the Navy, a US federal government work in the public domain (17 USC 105); no credit is required. Served by Eden Engine; not an official U.S. Naval Observatory product.

Use it

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agent

// 1. search: find the tool
omnial_search({ query: "what you need" })

// 2. inspect: price and input schema
omnial_inspect({ tool: "usno/moon-phases" })

// 3. learn: read the usage guide at runtime
omnial_learn({ tool: "usno/moon-phases" })

// 4. run: price the exact call first, then run it
omnial_execute({ tool: "usno/moon-phases", input: { /* see input_schema */ }, dry_run: true })
omnial_execute({ tool: "usno/moon-phases", input: { /* ... */ } })

// 5. settle: the call is charged when it finishes, nothing to do

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Pricing

Every charge this tool can incur.

Charge	Price
Per call	$0.0026

Updated: Oct 20, 2026

Input and output schemas

Input schema

input_schema.json

{
  "type": "object",
  "required": [
    "date"
  ],
  "properties": {
    "date": {
      "type": "string",
      "pattern": "^(1[7-9][0-9]{2}|20[0-9]{2}|2100)-(0?[1-9]|1[0-2])-(0?[1-9]|[12][0-9]|3[01])$",
      "description": "Start date as YYYY-MM-DD, for example 2026-10-01 (leading zeros on month and day are optional). The year must be 1700 to 2100. The list begins with the first phase on or after this date."
    },
    "nump": {
      "type": "integer",
      "default": 4,
      "maximum": 99,
      "minimum": 1,
      "description": "How many consecutive primary phases to return, 1 to 99. Defaults to 4, about one lunar month. 12 lunar cycles is 48."
    }
  },
  "additionalProperties": false
}

Output schema

output_schema.json

{
  "type": "object",
  "required": [
    "phasedata"
  ],
  "properties": {
    "day": {
      "type": "integer",
      "description": "Start day."
    },
    "year": {
      "type": "integer",
      "description": "Start year as understood by the service."
    },
    "month": {
      "type": "integer",
      "description": "Start month."
    },
    "numphases": {
      "type": "integer",
      "description": "Number of phases returned."
    },
    "phasedata": {
      "type": "array",
      "items": {
        "type": "object",
        "properties": {
          "day": {
            "type": "integer"
          },
          "time": {
            "type": "string",
            "description": "HH:MM in Universal Time."
          },
          "year": {
            "type": "integer"
          },
          "month": {
            "type": "integer"
          },
          "phase": {
            "type": "string",
            "description": "New Moon, First Quarter, Full Moon or Last Quarter."
          }
        },
        "additionalProperties": true
      },
      "description": "The phases in date order."
    },
    "apiversion": {
      "type": "string",
      "description": "USNO API version that produced the data."
    }
  },
  "description": "The USNO moon-phases response.",
  "additionalProperties": true
}