| Acronym | Meaning |
![](file.png) | ARC | Astrophysical Research Consortium |
![](file.png) | PPM | Positions And Proper Motions (catalog) |
![](file.png) | NSA | National Security Agency |
![](file.png) | POCC | Payload/Platform Operations Control Center |
![](file.png) | FFT | Fast Fourier Transform |
![](file.png) | HIRDLS | High Resolution Dynamics Limb Sounder |
![](file.png) | CBR | Cosmic Background Radiation |
![](file.png) | LEO | Low Earth Orbit |
![](file.png) | GIF | Graphics Interchange Format |
![](file.png) | CM | Central Meridian |