| Acronym | Meaning |
 | GHA | Greenwich Hour Angle |
| OTHB | Over The Horizon Backscatter |
| UPPP | Union Pour La Promotion De La Propulsion Photonique |
| DEC | Declination |
| ORFEUS | Orbiting And Retrievable Far And Extreme Ultraviolet Spectrometer |
| SAR | Search And Rescue / Synthetic Aperture Radar |
| GSFC | Goddard Space Flight Center |
| PCGG | PCG Glovebox |
| BD | Bonner Durchmusterung (catalog) |
| DACS | DATA Acquisition And Control Subsystem |
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