---
title: "Egyptian Days (Dies Aegyptiaci) (埃及凶日)"
method: GET
path: "/api/trpc/egyptianDays.check"
tags: ["Western"]
---

# Egyptian Days (Dies Aegyptiaci) (埃及凶日)

`GET /api/trpc/egyptianDays.check`

## Request

- Base URL: `https://api.asktian.com`
- URL: `https://api.asktian.com/api/trpc/egyptianDays.check`
- Auth: HTTP bearer

The medieval calendar's 24 unlucky days — two per month, marked 'D' at the head of every monthly calendar, shunned for new enterprises and above all for bloodletting — and the days that gave English the word DISMAL (dies mali → Anglo-Norman dis mal). Served from the mnemonic verse's own encoding: each month names one day counted from its START and one from its END ('Iani prima dies et septima fine timetur' — January's 1st, and the 7th-from-end = the 25th), a law this engine derives all 24 dates from and asserts against the standard double-sourced list at load. Check any date for membership (and which of the pair it is), get the next Egyptian day, or list a month with its verse arithmetic. The manuscript layers that vary by recension — the attached unlucky hours, the variant lists — are disclosed, never blended; Carlyle's 'dismal science' descends from this very calendar. Medieval calendar history served for reflection, not advice.

Cost: 1 TIAN Points per call. tRPC procedure `egyptianDays.check`.

## 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)