---
title: "Synastry (星盤合盤)"
method: GET
path: "/api/trpc/forecast.synastry"
tags: ["Western"]
---

# Synastry (星盤合盤)

`GET /api/trpc/forecast.synastry`

## Request

- Base URL: `https://api.asktian.com`
- URL: `https://api.asktian.com/api/trpc/forecast.synastry`
- Auth: HTTP bearer

Synastry — Western relationship astrology. Computes the aspects between two natal charts (conjunction, sextile, square, trine, opposition) on a real ephemeris, returning the key Sun/Moon/Venus/Mars contacts, a harmonious-vs-challenging tally, and a 0–100 compatibility score.

Cost: 5 TIAN Points per call. tRPC procedure `forecast.synastry`.

## 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)