| Acronym | Meaning |
| LHA | Local Hour Angle |
| DARA | Deutsche Agentur Fuer Raumfahrtangelegenheiten |
| SL | (Comet) Shoemaker-Levy / SpaceLab |
| JCMT | James Clerk Maxwell Telescope |
| STS | Shuttle Transport System / Space Transportation System |
| GC | Globular Cluster |
| EODC | Earth Observation Data Centre |
| ACRV | Assured Crew Return Vehicle |
| E | Elliptical (for Galaxies) |
| TDT | Terrestrial Dynamic Time |