| Answer | Crossword Clue |
|---|---|
| LUNARMONTH | Astronomer's time unit. |
| LIGHTYEAR | Astronomer's unit. |
| LTYR | Astronomer's unit: Abbr. |
| PARSEC | Astronomer's unit of distance |
| NIGHT | Astronomer's prime time |
| GST | Astronomer's time: Abbr. |
| EON | Astronomer's time period |
| MEANSUN | Astronomer's concept as aid in calculating time. |
