---
title: "Transits"
method: POST
path: "/transits"
tags: ["Prognostics"]
---

# Transits

`POST /transits`

Calculate transit planet aspects to natal planets for a given date. Returns applying and separating aspects.

## Request body

- Transits — Birth data for a single natal chart. Required: date (YYYY-MM-DD), time (HH:mm:ss). Coordinates are latitude and longitude in decimal degrees, plus timezoneOffset in hours from UTC; the short forms lat, lon, lng and tz are rejected with 400 INVALID_FIELD. Omitting the coordinates is not the same as skipping them: houses, angles and everything derived from them are then computed for 0°N 0°E at UTC, which is a wrong answer rather than a neutral default.
  - `date` string, required
  - `time` string, required
  - `timezoneOffset` number, nullable
  - `latitude` number, nullable
  - `longitude` number, nullable
  - `houseSystem` string
  - `name` string
  - `city` string
  - `zodiacType` 'tropical' | 'sidereal'
  - `ayanamsaId` number, nullable
  - `cosmogram` boolean
  - `transitDate` string, required
  - `transitTime` string
  - `transitTzOffset` number, nullable

## Response `200`

Successful calculation

- object
  - `ok` boolean
  - `data` object
    - `input` object, nullable
      - `name` string, nullable
      - `date` string, nullable
      - `time` string, nullable
      - `timezoneOffset` number, nullable
      - `latitude` number, nullable
      - `longitude` number, nullable
      - `houseSystem` string, nullable
    - `julianDay` number, nullable
    - `siderealTime` number, nullable
    - `planets` object[], nullable
      - `id` number, nullable
      - `name` string, nullable
      - `longitude` number, nullable
      - `latitude` number, nullable
      - `distance` number, nullable
      - `speedLong` number, nullable
      - `speedLat` number, nullable
      - `speedDist` number, nullable
      - `isRetrograde` boolean, nullable
      - `declination` number, nullable
      - `rightAscension` number, nullable
    - `houses` object, nullable
      - `system` string, nullable
      - `cusps` number[], nullable
      - `ascendant` number, nullable
      - `mc` number, nullable
      - `armc` number, nullable
      - `vertex` number, nullable
    - `aspects` object[], nullable
      - `planet1` string, nullable
      - `planet2` string, nullable
      - `planet1Id` number, nullable
      - `planet2Id` number, nullable
      - `type` object, nullable
        - `name` string, nullable
        - `angle` number, nullable
        - `symbol` string, nullable
        - `isMajor` boolean, nullable
      - `exactAngle` number, nullable
      - `orb` number, nullable
      - `isApplying` boolean, nullable
    - `parallelAspects` object[], nullable
      - `planet1` string, nullable
      - `planet2` string, nullable
      - `planet1Id` number, nullable
      - `planet2Id` number, nullable
      - `type` string, nullable
      - `exactDiff` number, nullable
      - `orb` number, nullable
    - `antiscia` object[], nullable
      - `planetId` number, nullable
      - `planetName` string, nullable
      - `antiscion` number, nullable
      - `contraAntiscion` number, nullable
    - `antisciaAspects` unknown[], nullable
      - unknown

## Other responses

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

---

[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/793e5c2dbcdf/schema)