---
title: "Lunar Return (Monthly Chart) (月亮回歸盤)"
method: GET
path: "/api/trpc/lunarReturn.calculate"
tags: ["Western"]
---

# Lunar Return (Monthly Chart) (月亮回歸盤)

`GET /api/trpc/lunarReturn.calculate`

## Request

- Base URL: `https://api.asktian.com`
- URL: `https://api.asktian.com/api/trpc/lunarReturn.calculate`
- Auth: HTTP bearer

The LUNAR RETURN — the Western monthly return chart, cast for the instant the transiting Moon comes back to its natal degree every 27.3 days: the emotional month's opening bell, and the missing member of the returns family the catalogue already served (solar return via Tajika varshaphala, secondary progressions, solar arc — now complete). The return instant is found by local root-finding on the house ephemeris's lunar longitude, and THE PHYSICS IS THE TEST SUITE: every computed return puts the Moon back on the natal degree to the ARCMINUTE, consecutive returns sit 27.2–27.6 days apart (the sidereal month breathing with lunar eccentricity), and a calendar year holds 13 or 14 of them — all asserted in tests. Serves the current cycle's return instant (UTC), the classical bodies' positions at that moment, the Sun–Moon phase context, and the next return — for any birth data and any target date across two centuries. House placement needs a birth location and is honestly left to the chart-reading layer. A Western predictive technique served for study and reflection — not event prediction, not advice. Pure computation, no LLM.

Cost: 2 TIAN Points per call. tRPC procedure `lunarReturn.calculate`.

## Query parameters

- `input` string

## Response `200`

tRPC result envelope

- TrpcResult: tRPC HTTP response envelope.
  - `result` object
    - `data` object: The procedure's return value (system-specific).

---

[API](https://skmtc.dev/asktian/apis/asktian-metaphysics-api.md) · [All operations](https://skmtc.dev/asktian/apis/asktian-metaphysics-api/llms.txt) · [OpenAPI document](https://skmtc.dev/asktian/apis/asktian-metaphysics-api/revisions/3c8fdc979206?raw)