| Acronym | Meaning |
 | PMS | Pre-Main Sequence |
| TDRS | Tracking And Data Relay Satellite |
| JD | Julian Date; Julian Day (Number) |
| VTVL | Vertical Takeoff Vertical Landing |
| MOTV | Manned Orbital Transfer Vehicle |
| TRMM | Tropical Rainfall Measuring Mission |
| CEA | Center For EUV Astrophysics |
| SSCE | Solid Surface Combustion Experiment |
| FFT | Fast Fourier Transform |
| CG | Center Of Gravity |
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