---
title: "Moon Phase (SVG)"
method: POST
path: "/render/moon-phase"
tags: ["Visualization"]
---

# Moon Phase (SVG)

`POST /render/moon-phase`

Render the moon disk with its illuminated fraction at the given moment. Returns SVG plus illumination metrics.

## Request body

- MoonPhase — Birth data for a single natal chart. Required: date (YYYY-MM-DD), time (HH:mm:ss). Coordinates are latitude and longitude in decimal degrees, plus timezoneOffset in hours from UTC; the short forms lat, lon, lng and tz are rejected with 400 INVALID_FIELD. Omitting the coordinates is not the same as skipping them: houses, angles and everything derived from them are then computed for 0°N 0°E at UTC, which is a wrong answer rather than a neutral default.
  - `date` string, required
  - `time` string, required
  - `timezoneOffset` number, nullable
  - `latitude` number, nullable
  - `longitude` number, nullable
  - `houseSystem` string
  - `name` string
  - `city` string
  - `zodiacType` 'tropical' | 'sidereal'
  - `ayanamsaId` number, nullable
  - `cosmogram` boolean
  - `options` object
    - `size` integer
    - `theme` 'light' | 'dark' | 'console'
    - `showAspects` boolean
    - `showRetrograde` boolean
    - `title` string
    - `format` 'svg' | 'json'
    - `showLabel` boolean

## Response `200`

Successful calculation

- object
  - `ok` boolean
  - `data` object
    - `svg` string, nullable
    - `illuminationFraction` number, nullable
    - `elongationDeg` number, nullable
    - `waxing` boolean, nullable
    - `phase` string, nullable

## Other responses

- `400` — Validation error
- `401` — Missing or invalid API key

---

[API](https://skmtc.dev/astroway/apis/astroway-calculation-api.md) · [All operations](https://skmtc.dev/astroway/apis/astroway-calculation-api/llms.txt) · [OpenAPI document](https://skmtc-service-production.skmtc.workers.dev/v1/apis/astroway/astroway-calculation-api/revisions/793e5c2dbcdf/schema)