Season
September Equinox 2027
| Date | September 23, 2027 |
| Type | Season |
| Visible from | Visible everywhere in the US and Canada; day and night are approximately equal length. |
The Sun crosses the celestial equator heading south, marking the astronomical start of autumn in the Northern Hemisphere and the return of longer, darker nights good for stargazing.
Best viewing tip
Clear autumn air and earlier sunsets make the weeks after this equinox some of the best of the year for dark-sky trips.