Western Astrology

Western Moon Phase Calendar

Returns lunar phase data for every day in a given month, each day computed at 18:00 UTC (same fields as the moon phase endpoint). The days of the month's New Moons, First Quarters, Full Moons and Last Quarters carry principal_phase and its exact instant (principal_phase_at, UTC): use those, not the 45-degree phase_name bands, to mark full and new moon dates. Defaults to current month (UTC) if no year/month given.

get/v1/western/moon/calendar

Request

  • Base URL: https://api.asterwise.com
  • URL: https://api.asterwise.com/v1/western/moon/calendar
  • Auth: HTTP bearer

Query parameters

yearinteger nullable

Year (e.g. 2026), 1-3000. Defaults to the current year (UTC).

monthinteger nullable

Month number 1-12. Defaults to the current month (UTC).

Response

Successful Response

successboolean

True if the request succeeded

messagestring

Human-readable status message

Example response

{
  "data": [
    {
      "phase_name": "Full Moon",
      "illumination_pct": 99.79,
      "next_phase_at": "2026-10-26T04:11:49Z",
      "computed_at": "2026-05-01T18:00:00Z",
      "principal_phase": "Full Moon"
    }
  ]
}

Changes

No recorded changes to this operation across all 2 revisions of this API.