---
title: "Get Umbra Timeline"
method: GET
path: "/eclipse/umbra/{eclipse_date}"
tags: ["eclipse"]
---

# Get Umbra Timeline

`GET /eclipse/umbra/{eclipse_date}`

The umbra/antumbra outline sweeping across the Earth, as a timelapse of
GeoJSON Polygon features — one per `step_seconds` from first to last umbral
contact. Same antimeridian handling as `/path`.

## Path parameters

- `eclipse_date` string, required

## Query parameters

- `step_seconds` integer — Seconds between umbra snapshots (30–600).

## Response `200`

Successful Response

- UmbraFeatureCollection — GeoJSON FeatureCollection: one Polygon (or MultiPolygon, antimeridian) Feature per time step, tracing the umbra/antumbra sweeping across the Earth. Feature `properties` carry `time_utc` (ISO), `sun_alt_deg`, `center_lat`, `center_lon`, and `width_km`; collection-level `first_contact_utc` / `last_contact_utc` bound the umbral track.
  - `type` string
  - `eclipse_date` string, required
  - `eclipse_type` string, required
  - `step_seconds` integer, required
  - `first_contact_utc` string, nullable, required
  - `last_contact_utc` string, nullable, required
  - `features` UmbraFeature[], required
    - `type` string
    - `geometry` GeoJSONGeometry, required
      - `type` string, required — LineString, MultiLineString, Polygon, or MultiPolygon. The Multi* variants appear when a geometry is split at the antimeridian (RFC 7946), so consumers must accept both the single and Multi forms.
      - `coordinates` unknown[], required
        - unknown
    - `properties` object, required
  - `attribution` string

## Other responses

- `422` — Validation Error

---

[API](https://skmtc.dev/stardrift/apis/fastapi.md) · [All operations](https://skmtc.dev/stardrift/apis/fastapi/llms.txt) · [OpenAPI document](https://skmtc-service-production.skmtc.workers.dev/v1/apis/stardrift/fastapi/revisions/00746572572a/schema)