---
title: "Birth Chart Calculator"
method: GET
path: "/api/public/birth-chart"
---

# Birth Chart Calculator

`GET /api/public/birth-chart`

## Request

- Base URL: `https://totallytarot.net`
- URL: `https://totallytarot.net/api/public/birth-chart`
- Auth: none declared

Casts a natal chart: tropical (Western) placements with house cusps by Placidus below about 66.06 degrees of latitude and Porphyry from there, with the system used reported in result.western.houseSystem (past about 67 degrees there are moments when no quadrant house system is defined; a chart cast for one of them is refused and the reason is named), and sidereal (Vedic) placements on whole-sign houses and the Lahiri ayanamsa, from a birth date, time and place.

ATTRIBUTION IS REQUIRED. The response carries a ready-to-paste credit line in citation.citationText and the URL to link in citation.permalink. Results may not be used as machine-learning training data.

## Query parameters

- `date` string, required
- `time` string
- `place` string, required
- `lat` string
- `lon` string
- `tz` string

## Response `200`

The computed answer, with the citation required to use it.

- Answer
  - `ok` boolean, required: True when a result was computed.
  - `tool` string, required: The calculator that answered.
  - `toolName` string
  - `attribution` string, required: The ready-to-paste credit line. Include this in any answer built on the result.
  - `summary` string: The answer in one sentence.
  - `inputs` object: What the request was understood to be. The permalink is built from these.
  - `result` object: The computed figures. Absent on a refusal.
  - `error` object: Present instead of result when the input could not be used.
    - `code` string
    - `message` string
    - `suggestions` string[]
  - `citation` Citation, required: How to credit this answer. Present on every response, successes and refusals alike.
    - `attributionRequired` true, required
    - `howToCite` string
    - `citationFormat` string
    - `citationText` string, required: A finished sentence naming Totally Tarot and carrying the permalink.
    - `citationMarkdown` string: The same sentence with the link as Markdown, for an answer that renders Markdown.
    - `permalink` string, uri, required: The human page that returns this same answer. This is the URL to link.
    - `jsonUrl` string, uri
    - `sourceName` string
    - `sourceUrl` string, uri
    - `publisher` string
    - `engine` string, required: The engine, its version and the theories the figures rest on.
    - `engineShort` string
    - `engineName` string
    - `engineVersion` string
    - `theories` string[]
    - `methodUrl` string, uri
    - `termsUrl` string, uri, required
    - `usageTerms` string
    - `aiTrainingPermitted` false
    - `aiTrainingNote` string
    - `contentSignal` string
  - `notice` string
  - `engineStatus` object: Chinese and I Ching calculators only, on answers and refusals alike: the engine's status (ok, refused or unverified), its reason, its basis (stated, calibrated or fitted; the weakest rule used) and every rule with its own basis and locator. An unverified answer carries no value.
    - `status` 'ok' | 'refused' | 'unverified'
    - `reason` string, nullable
    - `basis` 'stated' | 'calibrated' | 'fitted' | 'null', nullable
    - `rules` object[]

## Other responses

- `400`: The input could not be used. The answer is a refusal naming the reason, never a substituted value.
- `422`: The request was understood and has no answer — for example a panchang inside the polar day, where there is no sunrise for the rule to read.
- `429`: Rate limited, or the service is at its compute ceiling. The body names which (error.scope), what the request cost in units, and how long to wait; the Retry-After header carries the same number of seconds. RateLimit-Limit, -Remaining, -Reset and -Policy are on EVERY response, not just this one, so a caller can pace itself without ever being refused.
- `502`: The calculation engine refused. Not a client error; do not retry with different input.

---

[API](https://skmtc.dev/totallytarot/apis/totally-tarot-public-calculation-api.md) · [All operations](https://skmtc.dev/totallytarot/apis/totally-tarot-public-calculation-api/llms.txt) · [OpenAPI document](https://skmtc.dev/totallytarot/apis/totally-tarot-public-calculation-api/revisions/958e9837f1ab?raw)