| Acronym | Meaning |
 | MRIR | Medium Resolution Infrared Radiometer |
| SOLSTICE | Solar Stellar Irradiance Comparison Experiment |
| IAUC | IAU Circular |
| MOL | Manned Orbiting Laboratory |
| INTELSAT | International Telecommunications Satellite |
| OMS | Orbital Maneuvering System |
| APL | Applied Physics Laboratory (at Johns Hopkins) |
| PLBD | Payload Bay Doors |
| TAL | Transatlantic Abort Landing |
| NPO | Scientific Production Organization |
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