N2YO REST API

Precomputed pass predictions, positions and TLEs, keyed by NORAD ID. Handy when you do not want to run SGP4 yourself.

Source: https://www.n2yo.com/api/
Access: Free API key. 1,000 requests/hour per key for radiopasses.
Format: JSON

Schema

Field	Type	Note
/radiopasses/{id}/{lat}/{lng}/{alt}/{days}/{min_elevation}	endpoint
info.satname, satid, passescount	meta
passes[].startUTC, maxUTC, endUTC	unix s	AOS, TCA, LOS
passes[].startAz, maxAz, endAz	deg	Azimuths
passes[].startAzCompass, maxAzCompass, endAzCompass	string	NNE etc.
passes[].maxEl	deg	Peak elevation
/positions/{id}/{lat}/{lng}/{alt}/{seconds}	endpoint	Per-second az/el/lat/lon
/tle/{id}	endpoint	Current TLE

Example

GET /rest/v1/satellite/radiopasses/27607/37.77/-122.42/20/2/10&apiKey=KEY
{"info":{"satname":"SAUDISAT 1C (SO-50)","satid":27607,"passescount":5},
 "passes":[{"startAz":201.3,"startAzCompass":"SSW","startUTC":1758300000,
            "maxAz":278.9,"maxEl":54.2,"maxUTC":1758300420,
            "endAz":352.1,"endUTC":1758300830}]}

Gotchas

Their predictions use their TLE cache, which can be a day old.
Altitude is in meters. min_elevation is a hard filter.