Western Moon Phase
asterwise_get_western_moon_phaseCalculates the tropical lunar phase for any date using Swiss Ephemeris. Returns the phase name, phase angle, illumination percentage, Moon age in days, and the next major phase transition.
WORKFLOW: BEFORE: None — standalone. AFTER: asterwise_get_western_moon_calendar — get the full month's phase data.
INPUT CONTRACT: date (optional string YYYY-MM-DD, years 1-3000) — Date to compute phase for. Defaults to today (UTC). An invalid or out-of-range date → 422 validation_error, surfaces as MCP INTERNAL_ERROR with the API message. Example: '2026-05-01'
DO NOT CONFUSE WITH: asterwise_get_western_moon_calendar — full monthly day-by-day phase table. asterwise_get_panchanga — Vedic tithi system (lunar day based on 12° arc increments).
Full output and error contract: https://docs.asterwise.com/mcp/tools/get-western-moon-phase/
Input Schema
| Name | Required | Description | Default |
|---|---|---|---|
| date | No | Date for the moon phase, YYYY-MM-DD (years 1-3000). Defaults to today (UTC). | |
| response_format | No | Output format: 'markdown' (default) for a readable report, or 'json' for the raw structured payload. | markdown |
Output Schema
| Name | Required | Description | Default |
|---|---|---|---|
| result | Yes |