| Acronym | Meaning |
 | SOFIA | Stratospheric Observatory For Infrared Astronomy |
| ET | Ephemeris Time |
| MDSSC | McDonnell Douglas Space Systems Corp |
| ACRIM | ACR Irradiance Monitor |
| AGU | American Geophysical Union |
| SPOT | Systeme Probatoire Pour L'Observation De La Terre |
| VOIR | Venus Orbiting Imaging Radar |
| ANSI | American National Standards Institute |
| WMO | World Meterological Organisation |
| ICE | International Cometary Explorer |
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