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Except units of measure, abbreviated terms are spelled out the first time they are used. Thereafter, the abbreviations are generally used alone. They can all be found in the Glossary.
Units of Measure
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1 The Solar System
2 Reference Systems
3 Gravity & Mechanics
5 Planetary Orbits
7 Mission Inception
9 S/C Classification
11 Onboard Systems
12 Science Instruments
17 Extended Operations
18 Deep Space Network