set(SRCS CoordGeodetic.cpp CoordTopocentric.cpp DateTime.cpp DecayedException.cpp Eci.cpp Globals.cpp Observer.cpp OrbitalElements.cpp SGP4.cpp SatelliteException.cpp SolarPosition.cpp TimeSpan.cpp Tle.cpp TleException.cpp Util.cpp Vector.cpp) add_library(sgp4 STATIC ${SRCS})