Editing SimTX API/Packets/PassPredictionRequest (section)

== Behaviour ==
* Exactly one of <code>observer_station_id</code> and <code>observer</code>. An observer station must be a ground station that currently has a live session on that server and is PUBLIC or your own; otherwise the request is answered with [[SimTX API/Packets/Error|Error]] <code>NOT_FOUND</code> (<i>Unknown observer station on this server; send the observer location instead</i>).
* The window may be at most 7 days long, between the years 1970 and 2200.
* Elevations are geometric (no refraction), on the 6,371 km sphere. See [[SimTX API/Satellites#Passes|Passes]] for the algorithm.
* Passes that overlap the window are clipped to it, and to a deorbiting satellite's reentry. An always-visible geostationary satellite gives one window-long pass; a never-visible one gives none.
* Satellite failures are answered with [[SimTX API/Packets/Error|Error]] as for [[SimTX API/Packets/EphemerisRequest|EphemerisRequest]].
* Heavy request.