curl -X POST https://sim.rotastellar.com/v1/passes \
-H "Content-Type: application/json" \
-d '{
"elements": {
"altitude_km": 550,
"inclination_deg": 53
},
"duration_hours": 24,
"min_elevation_deg": 10
}'
{
"passes": [
{
"station_id": "gs_svalbard",
"station_name": "Svalbard",
"provider": "KSAT",
"aos": "2026-03-08T12:34:56Z",
"los": "2026-03-08T12:45:23Z",
"duration_s": 627,
"max_elevation_deg": 45.6,
"points": [
{
"timestamp": "2026-03-08T12:34:56Z",
"elevation_deg": 10.0,
"azimuth_deg": 90.5,
"range_km": 2500.1
}
]
}
],
"count": 8,
"start": "2026-03-08T12:00:00Z",
"duration_hours": 24,
"stations_checked": 12
}
Sim
Ground Passes
Compute ground station AOS/LOS windows with elevation data
POST
/
v1
/
passes
curl -X POST https://sim.rotastellar.com/v1/passes \
-H "Content-Type: application/json" \
-d '{
"elements": {
"altitude_km": 550,
"inclination_deg": 53
},
"duration_hours": 24,
"min_elevation_deg": 10
}'
{
"passes": [
{
"station_id": "gs_svalbard",
"station_name": "Svalbard",
"provider": "KSAT",
"aos": "2026-03-08T12:34:56Z",
"los": "2026-03-08T12:45:23Z",
"duration_s": 627,
"max_elevation_deg": 45.6,
"points": [
{
"timestamp": "2026-03-08T12:34:56Z",
"elevation_deg": 10.0,
"azimuth_deg": 90.5,
"range_km": 2500.1
}
]
}
],
"count": 8,
"start": "2026-03-08T12:00:00Z",
"duration_hours": 24,
"stations_checked": 12
}
Base URL:
https://sim.rotastellar.com
— No API key required.Request
object
required
Orbital elements. See Orbital Elements.
string
ISO 8601 start time. Defaults to current time.
number
Prediction window in hours. Default: 24. Max: 72.
number
Minimum satellite elevation above horizon (degrees). Default: 5.
array
Custom ground station list. Defaults to the 12-station global network (KSAT, NASA, AWS). Each station needs
id, name, lat, lon.curl -X POST https://sim.rotastellar.com/v1/passes \
-H "Content-Type: application/json" \
-d '{
"elements": {
"altitude_km": 550,
"inclination_deg": 53
},
"duration_hours": 24,
"min_elevation_deg": 10
}'
{
"passes": [
{
"station_id": "gs_svalbard",
"station_name": "Svalbard",
"provider": "KSAT",
"aos": "2026-03-08T12:34:56Z",
"los": "2026-03-08T12:45:23Z",
"duration_s": 627,
"max_elevation_deg": 45.6,
"points": [
{
"timestamp": "2026-03-08T12:34:56Z",
"elevation_deg": 10.0,
"azimuth_deg": 90.5,
"range_km": 2500.1
}
]
}
],
"count": 8,
"start": "2026-03-08T12:00:00Z",
"duration_hours": 24,
"stations_checked": 12
}
Default Ground Stations
The service includes a 12-station global network:| Station | Location | Provider |
|---|---|---|
| Svalbard | 78.2°N, 15.4°E | KSAT |
| Troll | 72.0°S, 2.5°E | KSAT |
| Awarua | 46.5°S, 168.4°E | KSAT |
| Fairbanks | 64.9°N, 147.9°W | NASA |
| Wallops | 37.9°N, 75.5°W | NASA |
| McMurdo | 77.9°S, 166.7°E | NASA |
| Singapore | 1.4°N, 103.8°E | AWS |
| Bahrain | 26.1°N, 50.5°E | AWS |
| Oregon | 43.8°N, 120.6°W | AWS |
| Cape Town | 33.9°S, 18.4°E | AWS |
| Stockholm | 59.3°N, 18.1°E | AWS |
| Sydney | 33.9°S, 151.2°E | AWS |