---
title: "Moon Phase (public, no key)"
method: GET
path: "/public/moon-phase"
tags: ["Public"]
---

# Moon Phase (public, no key)

`GET /public/moon-phase`

Geocentric moon phase for a date (computed at noon UTC): deterministic, no AI, no birth data. `_footer` watermark. The English `phaseName`, `moonSign` and `sunSign` are the stable identifiers to match on and never change; `localized` carries the same three in the requested language.

## Query parameters

- `date` string, date
- `lang` string

## Headers

- `Accept-Language` string

## Response `200`

OK

- object
  - `ok` boolean
  - `data` object
    - `date` string, nullable
    - `phase` number, nullable
    - `phaseName` string, nullable
    - `majorPhase` string, nullable
    - `illuminationPercent` number, nullable
    - `elongationDeg` number, nullable
    - `ageDays` number, nullable
    - `waxing` boolean, nullable
    - `moonSign` string, nullable
    - `sunSign` string, nullable
    - `localized` object, nullable
      - `phaseName` string, nullable
      - `moonSign` string, nullable
      - `sunSign` string, nullable
  - `_footer` string — Free-tier watermark, present on every public response. Keys on a paid plan do not receive it.

## Other responses

- `400` — Invalid sign or date

---

[API](https://skmtc.net/astroway/apis/astroway-calculation-api.md) · [All operations](https://skmtc.net/astroway/apis/astroway-calculation-api/llms.txt) · [OpenAPI document](https://skmtc-service-staging.skmtc.workers.dev/v1/apis/astroway/astroway-calculation-api/revisions/529d7d36d7d6/schema)