| Acronym | Meaning |
 | ET | Ephemeris Time |
| MMPO | Mission Management And Planning Office |
| MMS | Multi-mission Modular Spacecraft |
| ARC | Ames Research Center (NASA) |
| UKST | United Kingdom Schmidt Telescope |
| OAO | Orbiting Astronomical Observatory |
| MMT | Multiple Mirror Telescope |
| SEM | Space Environment Monitor |
| DMSP | Defense Meteorological Satellite Program |
| UTC | Coordinated Universal Time |
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