| Abbreviation | Definition |
|---|---|
| CT | Cerro Tololo |
| CTO | Color Temperature Orange |
| CTRF | Celestial and Terrestrial Reference Frames |
| C-TYPE | Carbonaceous (Asteroid) |
| CVA | Central Valley Astronomers |
| CVAS | Cache Valley Astronomical Society |
| CVAS | Chagrin Valley Astronomical Society |
| CVAS | Chippewa Valley Astronomical Society |
| CVN | Canes Venatici |
| CVN | Canes Venatici (A constellation in the Northern Hemisphere near Ursa Major and Bo??tes, under the handle of the Big Dipper) |
| CVN | Canes Venatici (A constellation in the Northern Hemisphere near Ursa Major and Boötes, under the handle of the Big Dipper) |
| CVP | Continuously Variable Planetary |
| CVS | Concurrent Versioning System |
| CW | ClockWise |
| D | Diameter |
| D | Direct |
| DAC | Distance, Amplitude, Correction |
| DAG | Do??u Anadolu Gozlemevi |
| DAG | Dogu Anadolu Gozlemevi |
| DAG | Do u Anadolu Gozlemevi |