---
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 — Hours from UTC at the given moment, not minutes. Fractional zones are hours too: 5.5 for India, 5.75 for Nepal, -3.5 for Newfoundland. Defaults to 0, meaning UTC.
    - `latitude` number, required
    - `longitude` number, required
    - `houseSystem` string
    - `name` string
    - `city` string
    - `zodiacType` 'tropical' | 'sidereal'
    - `ayanamsaId` number, nullable
    - `ayanamsa` 'fagan-bradley' | 'lahiri' | 'de-luce' | 'raman' | 'krishnamurti' | 'kp' | 'yukteshwar' | 'jn-bhasin' | 'true-citra' | 'djwhal-khul' — Sidereal school by name. Lahiri when omitted. Equivalent to ayanamsaId; send either.
    - `cosmogram` boolean
  - `events` object[], required
    - `date` string, required
    - `type` 'marriage' | 'divorce' | 'child' | 'death_close' | 'career' | 'move' | 'illness' | 'education' | 'accident' | 'other'
    - `description` string
    - `weight` number
  - `searchRangeMinutes` number
  - `stepMinutes` number
  - `methods` object
    - `symbolic` boolean
    - `primary` boolean
    - `progression` boolean
  - `orb` number

## 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

- **2026-08-23** `6828e5609564` — 4 breaking, 9 warning, 2 info
  - the request property `events/items/weight` became not nullable
  - the request property `orb` became not nullable
  - the request property `searchRangeMinutes` became not nullable
  - the request property `stepMinutes` became not nullable
  - …11 more
- **2026-08-18** `dd3764875e7a` — 1 info
  - added the new optional request property `baseInput/ayanamsa`
- **2026-08-15** `e637d1a9911b` — 2 warning
  - the `baseInput/timezoneOffset` request property's max was set to `14.00`
  - the `baseInput/timezoneOffset` request property's min was set to `-14.00`
- **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/8ab5a768b521/schema)