| Answer | Crossword Clue |
|---|---|
| REVOLUTION | Relative of an orbit. |
| APOGEE | Part of an orbit. |
| SUN | Center of many an orbit |
| APSE | ... line (major axis of an elliptical orbit) |
| APSIS | One of two points in an orbit. |
| APSIS | Either of two extremes in an orbit |
| SYZYGY | Either of two opposing points in an orbit. |
