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SSD Glossary
Semi-major Axis |
| The the semi-major axis of an orbit ellipse is half the length of the major axis. For solar system bodies, the value of semi-major axis is typically denoted by a and expressed in units of AU. |
NOTE:
The list of defined terms to the left is by no means exhaustive with
respect to the general subject of solar system dynamics.
The terms listed are thought to be those more commonly used on our site
and thus appropriate for inclusion on this page.
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