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Tanod skypeek Satellite Pass Predictor
x402
Tanod skypeek Satellite Pass Predictor is a paid API for AI agents from tanod.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-12).
Predicts upcoming satellite passes (start, peak, end times, elevation, azimuth, and naked-eye visibility) over a given ground location using SGP4 orbital mechanics on CelesTrak TLE data.
Price / call$0.002
Success—
StatusUnknown
How this service works
One MCP server and HTTP API with 193 pay-per-call tools for AI agents (security checks, chain data, finance, aviation, documents), plus free uptime and MikroTik monitoring and 130+ free browser tools. No signup; free daily tier. Operated by an AI.
Output
A JSON object containing a list of predicted passes, each with start/max/end sub-objects holding UTC timestamps, azimuth in degrees, compass direction, and elevation in degrees; a visibility boolean and reason string (e.g. 'sky_too_bright', 'visible'); sun altitude at max elevation; pass duration in seconds; plus satellite metadata (name, NORAD ID), observer coordinates, computation window, orbital elements freshness (age in hours and stale flag), and a source attribution block referencing CelesTrak.
Example use cases
ISS spotting from backyard
“I'm in Denver, Colorado — latitude 39.74, longitude -104.98, about 1600 metres altitude. When can I actually see the ISS with my naked eye in the next 3 days? Only show passes where the sky is dark enough and the station is sunlit.”
Weather satellite pass scheduling
“I need to know when NOAA 19 — NORAD ID 33591 — will pass over London (51.5°N, 0.12°W) in the next 2 days with an elevation above 20 degrees, so I can schedule a ground station reception window.”
Astronomy event planning
“Can you list all satellite passes over Tokyo (35.68°N, 139.69°E) tomorrow night that reach at least 40 degrees elevation? I'm planning an astrophotography session and want to know what to expect in the sky.”
Technical details
Endpoint
POSThttps://tanod.dev/v1/space/passes?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need SGP4-accurate satellite pass predictions (start/peak/end times, azimuths, elevations, and naked-eye visibility) for a specific ground location over a short 1-3 day window. It is purpose-built for ISS and popular visual satellites tracked by CelesTrak, and directly flags observer-friendly passes (sunlit satellite, dark sky). Prefer it over generic astronomy APIs when you need structured, machine-readable pass data with compass directions, or when scheduling satellite radio reception or naked-eye observation sessions. It is not suitable for arbitrary NORAD IDs outside the CelesTrak stations/visual/NOAA groups, long-range forecasts beyond 3 days, or real-time tracking.
Side effects
- NORAD ID not in CelesTrak 'stations', 'visual', or NOAA 15/18/19 groups — returns error or empty result
- Stale orbital elements if CelesTrak data is unavailable — 'stale' flag set to true in response
- No passes found for given window/elevation combination — count:0 with empty passes array
- Invalid latitude/longitude range — schema validation error
- Days parameter outside 1-3 range — rejected by schema validation
- Network timeout or upstream CelesTrak fetch failure
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| lat | number | Latitude in degrees (-90 to 90). |
| lon | number | Longitude in degrees (-180 to 180). |
| days | integer | Window in days (1-3). |
| alt_m | number | Observer altitude in metres. |
| norad_id | integer | NORAD catalog number (default 25544, the ISS); CelesTrak 'stations' and 'visual' groups plus NOAA 15 / 18 / 19. |
| visible_only | boolean | Only passes that can be seen with the eye (satellite sunlit, sky dark). |
| min_elevation | number | Lowest elevation counted as a pass, in degrees above the horizon. |
Output
Schema · Response
{
"type": "json",
"example": {
"lat": 14.5995,
"lon": 120.9842,
"note": "Predictions from SGP4 on public orbital elements; real positions drift by a few km after days. 'visible' = satellite sunlit at its highest point and Sun at or below -6 degrees; brightness is not estimated. All times UTC. Azimuth is clockwise from true north.",
"alt_m": 0,
"count": 4,
"stale": false,
"passes": [
{
"end": {
"time": "2026-10-08T08:50:59Z",
"compass": "SSE",
"azimuth_deg": 149.5,
"elevation_deg": 10
},
"max": {
"time": "2026-10-08T08:47:40Z",
"compass": "SW",
"azimuth_deg": 233.4,
"elevation_deg": 69.7
},
"start": {
"time": "2026-10-08T08:44:20Z",
"compass": "NW",
"azimuth_deg": 317.3,
"elevation_deg": 10
},
"visible": false,
"duration_s": 399,
"visibility": "sky_too_bright",
"sunlit_at_max": true,
"sun_altitude_deg": 11.9
},
{
"end": {
"time": "2026-10-09T21:23:04Z",
"compass": "NE",
"azimuth_deg": 52.6,
"elevation_deg": 10
},
"max": {
"time": "2026-10-09T21:19:50Z",
"compass": "SE",
"azimuth_deg": 125.8,
"elevation_deg": 43.6
},
"start": {
"time": "2026-10-09T21:16:36Z",
"compass": "SSW",
"azimuth_deg": 199.1,
"elevation_deg": 10
},
"visible": true,
"duration_s": 388,
"visibility": "visible",
"sunlit_at_max": true,
"sun_altitude_deg": -7.3
}
],
"source": {
"url": "https://celestrak.org/NORAD/elements/",
"name": "CelesTrak GP data (orbital elements; only derived pass times are returned)",
"terms": "https://celestrak.org/usage-policy.php",
"notice": "Orbital elements: CelesTrak (T.S. Kelso), originally from 18 SDS / Space-Track. Passes are computed with SGP4 and are predictions, not observations.",
"license": "freely available; CelesTrak resource-use policy (no redistribution of element sets here)"
},
"window": {
"to": "2026-10-10T04:11:09Z",
"days": 2,
"from": "2026-10-08T04:11:09Z"
},
"satellite": {
"name": "ISS (ZARYA)",
"norad_id": 25544
},
"min_elevation_deg": 10,
"elements_age_hours": 0.1
}
}Tags
x402
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