---
title: "Rekichū Gedan (暦注下段 Banned Almanac Row) (曆注下段)"
method: GET
path: "/api/trpc/rekichuGedan.day"
tags: ["Japanese"]
---

# Rekichū Gedan (暦注下段 Banned Almanac Row) (曆注下段)

`GET /api/trpc/rekichuGedan.day`

## Request

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

REKICHŪ GEDAN (暦注下段) — the Japanese almanac's infamous 'lower section', the most-BANNED row in Japanese calendar history: the Edo bakufu suppressed it, the Meiji government outlawed it in 1873, and the bootleg 'ghost calendars' (お化け暦) kept printing it because the public kept buying. Served faithfully as the cultural history it is: 受死日 (the black ●, worst of all days), 十死日, 五墓日, 帰忌日 and 血忌日 (both attested in a Shōsōin calendar of 756 CE), 天火日, 地火日, the 三箇の悪日 (大禍・狼藉・滅門 — served in BOTH the classical birth-year mode and the modern everyone-mode, labeled), and the 重日 doubling days. TWO WITNESSES DIFFED CELL-FOR-CELL (the Japanese Wikipedia tables vs the koyomi8.com reference — every cell of every served table agreeing), months reckoned 節切り from the same exact month pillar the Dong Gong engine trusts. THE CLOSED FORMS ARE LAWS: 地火 = month branch + 3 — EXACTLY the 十二直's auspicious 'Taira' placement, the same day one table blesses and this one burns, the tradition's own contradiction carried rather than resolved — 帰忌 and 十死 cycle with period three, 天火 with period four, 受死 and 血忌 by their interleaving congruences, each proven against the witnessed cells for all twelve months at load. The 往亡日 and 復日 deferrals are CLOSED (v6.89.0): 往亡日 counts from the month term with the TERM DAY AS DAY 1 on the JST civil day of the instant — settled by the published 2026 dates and reproduced twelve-for-twelve at load — and 復日 is confirmed by a live independent 2026 listing; 凶会日 and the hour-level 時下食 remain deferred by name, never approximated. Tradition-report throughout — twice banned as superstition, served as history. Japanese becomes nineteen systems. Pure compute, no LLM.

Cost: 1 TIAN Points per call. tRPC procedure `rekichuGedan.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)