---
title: "Guaqi (六日七分 Hexagram Calendar) (卦氣值日)"
method: GET
path: "/api/trpc/guaqi.day"
tags: ["Eastern"]
---

# Guaqi (六日七分 Hexagram Calendar) (卦氣值日)

`GET /api/trpc/guaqi.day`

## Request

- Base URL: `https://api.asktian.com`
- URL: `https://api.asktian.com/api/trpc/guaqi.day`
- Auth: HTTP bearer

卦氣值日 — the Han dynasty's hexagram calendar: Meng Xi's 六日七分 system, in which the four cardinal hexagrams 坎震離兌 govern the seasons (their 24 lines ARE the 24 solar terms) and the remaining SIXTY hexagrams each rule six days and 7/80 of the year, opening with 中孚 at the winter solstice — 甲子卦氣起中孚, as the 易緯·稽覽圖 states. THE ARITHMETIC IS THE SYSTEM: 60 × 6日7分 = 365¼ exactly, and the witness table (黃宗羲《易學象數論》's 六日七分圖) prints cumulative day-counts for every row — 58 of 60 match the arithmetic exactly, the two misprints (蒙, 節) recorded verbatim and corrected by the law the table itself obeys. TRIPLE-VERIFIED: the same work's 卦氣 chapter independently states the 剝→復 run and it matches; the structure laws hold at load (exactly 坎離震兌 missing from the 64; the 公辟侯大夫卿 rank cycle perfect twelve times; the twelve 辟 exactly the 十二消息卦 with yang lines climbing 1→6 then yielding 5→0). Any date returns its ruling hexagram with rank, King Wen number, the tradition's own one-line gloss (陽氣復始; 一陽微動，生物甚難…), position within the 6日7分, the season's cardinal governor and its presiding line, and the month's 消息 sovereign — the year breathing in hexagram lines. A Han calendrical cosmology served for I Ching study — not prediction. Pure computation, no LLM.

Cost: 2 TIAN Points per call. tRPC procedure `guaqi.day`.

## 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)