| Interesting historical periods |
| Astronomical time period |
| Astronomical time periods |
| Pre-event periods |
| Periods from midnight to noon: Abbr. |
| Periods in history |
| Between-periods equipment |
| Accentuated periods |
| Astronomical altar |
| Periods of inactivity |
| Before-noon periods: Abbr. |
| Enero-to-diciembre periods |
| Geology class periods [subscribe to the best indie xwords today at avxwords.com] |
| Annual publication giving dates of astronomical and other events |
| Preceding periods |
| Periods of lessened hostilities |
| Noteworthy periods |
| Preparation periods |
| Astronomical periods |
| Altair or Sirius, astronomically speaking |
| Periods just past sunset |
| Astronomical rarity |
| Some rush-hour periods: Abbr. |
| Astronomical difference |
| Immeasurable periods |
| Astronomical flare-ups |
| It's used between periods |
| Astronomical data providers |
| Anticipatory periods |
| Wee-hours periods, for short |