Definition that contains universal time
- ert the coordinated universal time when an event is received on Earth
- trm the coordinated universal time when a transmission is sent from Earth to a spacecraft or other celestial body
- scet the coordinated universal time on board the spacecraft
- spacecraft event time the coordinated universal time on board the spacecraft
- earth-received time the coordinated universal time when an event is received on Earth
- transmission time the coordinated universal time when a transmission is sent from Earth to a spacecraft or other celestial body