| Acronym | Meaning |
 | DARA | Deutsche Agentur Fuer Raumfahrtangelegenheiten |
| SR | Special Relativity |
| WIYN | Wisconsin/Indiana/Yale/NOAO Telescope |
| TAI | International Atomic Time |
| WSMR | White Sands Missile Range |
| MACS | Modular Attitude Control System |
| NSSDC | National Space Science Data Center |
| HIRS | High Resolution Infrared Radiation Sounder |
| BBXRT | Broad-Band X-Ray Telescope |
| GRS | Gamma Ray Spectrometer |
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