---
title: "Algol Minimum"
method: POST
path: "/algol-minimum"
tags: ["Calendar & Cycles"]
---

# Algol Minimum

`POST /algol-minimum`

Find the nearest minimum brightness moment of Algol (Beta Persei), the eclipsing variable star, within a date range.

## Request body

- AlgolRange
  - `startDate` string, required
  - `endDate` string, required
  - `longitude` number, nullable

## Response `200`

Successful calculation

- object
  - `ok` boolean
  - `data` object
    - `count` number, nullable
    - `minima` object[], nullable
      - `jd` number, nullable
      - `date` string, nullable
      - `isNighttime` boolean, nullable

## Other responses

- `400` — Validation error
- `401` — Missing or invalid API key

## Changes

- **2026-08-24** `8ab5a768b521` — 2 warning, 2 info
  - removed the optional property `data/minima/items/period` from the response with the `200` status
  - removed the optional property `data/minima/items/time` from the response with the `200` status
  - added the optional property `data/count` to the response with the `200` status
  - added the optional property `data/minima/items/isNighttime` to the response with the `200` status

[Change history](https://skmtc.dev/astroway/apis/astroway-calculation-api/changes/algol-minimum/post.md)

---

[API](https://skmtc.dev/astroway/apis/astroway-calculation-api.md) · [All operations](https://skmtc.dev/astroway/apis/astroway-calculation-api/llms.txt) · [OpenAPI document](https://skmtc-service-production.skmtc.workers.dev/v1/apis/astroway/astroway-calculation-api/revisions/8ab5a768b521/schema)