---
title: "Biorhythm Best Days"
method: POST
path: "/wellness/biorhythm/best-days"
tags: ["Wellness"]
---

# Biorhythm Best Days

`POST /wellness/biorhythm/best-days`

## Request

- Base URL: `https://api.astroway.info/v1`
- URL: `https://api.astroway.info/v1/wellness/biorhythm/best-days`
- Auth: API key in header `X-Api-Key`
- TypeScript: <https://skmtc.dev/astroway/apis/astroway-calculation-api/docs/wellness/biorhythm/best-days/post.ts> (a function with typed inputs; its response is checked against the schema)

The highest-scoring days in a range (up to 366 days): score = 100 x (sum of the three cycle values + 3) / 6, critical days left out by default. A historical model, not a prediction and not health advice; the disclaimer travels with the answer.

## Query parameters

- `fields` string
- `precision` integer

## Headers

- `Idempotency-Key` string

## Request body

- BiorhythmBestDays
  - `birthDate` string, required
  - `rangeStart` string
  - `rangeEnd` string
  - `count` integer: How many days to return, best first.
  - `excludeCritical` boolean: Leave out days on which any cycle crosses zero.

## Response `200`

Successful calculation

- object
  - `ok` boolean
  - `data` object
    - `birthDate` string, nullable
    - `range` object, nullable
      - `start` string, nullable
      - `end` string, nullable
      - `days` number, nullable
    - `bestDays` object[], nullable
      - `date` string, nullable
      - `dayOfLife` number, nullable
      - `physical` number, nullable
      - `emotional` number, nullable
      - `intellectual` number, nullable
      - `critical` unknown[], nullable
        - unknown
      - `score` number, nullable
    - `formula` string, nullable
    - `disclaimer` string, nullable

## Other responses

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

## Changes

- **2026-11-07** `bf266b2e6703`: 1 info
  - endpoint added

[Operation history](https://skmtc.dev/astroway/apis/astroway-calculation-api/changes/wellness/biorhythm/best-days/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.dev/astroway/apis/astroway-calculation-api/revisions/bf266b2e6703?raw)