---
title: "Stream Retrograde Alerts"
method: POST
path: "/stream/retrograde-alerts"
tags: ["Real-time Streaming"]
---

# Stream Retrograde Alerts

`POST /stream/retrograde-alerts`

All planets retro state + next stations.

## Request body

- EmptyBody — This endpoint reads nothing from the request body. Send {} (or any object, which is ignored).

## Response `200`

Successful calculation

- object
  - `ok` boolean
  - `data` object
    - `timestamp` string, nullable
    - `planets` object[], nullable
      - `planet` string, nullable
      - `currentlyRetrograde` boolean, nullable
      - `currentLongitude` number, nullable
      - `sign` string, nullable
      - `speed` number, nullable
      - `nextStationAt` string, nullable
      - `nextStationType` string, nullable
      - `daysToStation` number, nullable
    - `nextEventAt` string, nullable
    - `tickSeconds` number, nullable
    - `transport` string, nullable
    - `sseUpgrade` string, nullable
    - `pricing` string, nullable

## Other responses

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

## Changes

- **2026-08-24** `8ab5a768b521` — 2 breaking, 14 info
  - the response property `data/planets/items/` became nullable for the status `200`
  - the `data/planets/items/` response's property type/format changed from ``/`` to `object`/`` for status `200`
  - added the optional property `data/nextEventAt` to the response with the `200` status
  - added the optional property `data/planets/items/currentLongitude` to the response with the `200` status
  - …12 more

[Change history](https://skmtc.dev/astroway/apis/astroway-calculation-api/changes/stream/retrograde-alerts/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)