| Acronym | Meaning |
 | AU | Astronomical Unit |
| NRL | Naval Research Laboratory |
| SOHO | SOlar Heliospheric Observatory |
| DAO | Dominion Astrophysical Observatory |
| WMO | World Meterological Organisation |
| SSRMS | Space Station Remote Manipulator System |
| TDT | Terrestrial Dynamic Time |
| APU | Auxiliary Power Unit |
| SSCE | Solid Surface Combustion Experiment |
| AOA | Abort Once Around (shuttle Abort Plan) |
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