---
title: "Rectification"
method: POST
path: "/rectification"
tags: ["Prognostics"]
---

# Rectification

`POST /rectification`

Rectify an approximate birth time using a list of life events and transit/direction hits to narrow the birth time window.

## Request body

- Rectification
  - `baseInput` ChartInput, required — Birth data for a single natal chart. Required: date (YYYY-MM-DD), time (HH:mm:ss), latitude and longitude in decimal degrees. The short forms lat, lon, lng and tz are rejected with 400 INVALID_FIELD; pass the full names. timezoneOffset is hours from UTC and defaults to 0, meaning UTC. city is a display label only: nothing here geocodes it, so it never stands in for coordinates.
    - `date` string, required
    - `time` string, required
    - `timezoneOffset` number, nullable
    - `latitude` number, required
    - `longitude` number, required
    - `houseSystem` string
    - `name` string
    - `city` string
    - `zodiacType` 'tropical' | 'sidereal'
    - `ayanamsaId` number, nullable
    - `cosmogram` boolean
  - `events` object[], required
    - `date` string, required
    - `description` string
    - `weight` number, nullable
  - `searchRangeMinutes` number, nullable
  - `stepMinutes` number, nullable
  - `methods` object
    - `symbolic` boolean
    - `primary` boolean
    - `progression` boolean
  - `orb` number, nullable

## Response `200`

Successful calculation

- object
  - `ok` boolean
  - `data` object
    - `candidates` object[], nullable
      - `time` string, nullable
      - `score` number, nullable
      - `matchedEvents` number, nullable

## Other responses

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

## Changes

- **2026-08-11** `b0533bcc12c0` — 4 breaking, 4 warning, 2 info
  - the request property `baseInput/latitude` became not nullable
  - the request property `baseInput/longitude` became not nullable
  - the request property `baseInput/latitude` became required
  - the request property `baseInput/longitude` became required
  - …6 more

[Change history](https://skmtc.dev/astroway/apis/astroway-calculation-api/changes/rectification/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/821c8bafa295/schema)