March equinox
20 MarchEquinoxes and solstices in 2031: exact UTC dates
The four seasonal turning points in 2031, listed to the minute in Universal Time from the U.S. Naval Observatory. The same annual dataset also supplies Earth’s perihelion and aphelion.
2031 dates: quick answer
- March equinox: .
- June solstice: .
- September equinox: .
- December solstice: .
June solstice
21 JuneSeptember equinox
23 SeptemberDecember solstice
22 DecemberOne instant, different local clocks. These are global astronomical instants in UT. In some time zones, conversion can place an event on the previous or next civil date.
Earth’s closest and farthest points from the Sun in 2031
| Orbital event | Official Universal Time |
|---|---|
| Perihelion — nearest to the Sun | |
| Aphelion — farthest from the Sun |
How to read these dates
An equinox is the instant when the Sun crosses the celestial equator. A solstice is the instant when the Sun reaches its greatest northward or southward declination. The labels “March equinox”, “June solstice”, “September equinox” and “December solstice” avoid implying the same season in both hemispheres.
Perihelion and aphelion describe Earth’s orbital distance, not the start of a season. They are included because USNO returns all six events in one annual seasons-and-apsides dataset and because they provide useful context without inventing a second calculation.
Official source and method
The dates come from the official USNO seasons API response for 2031, retrieved 2026-09-20, API version 4.0.1. SkyClock stores the response as a checked-in snapshot, validates all six events and makes no live API request during a build or page visit.
USNO describes these data as suitable for general public information and requests appropriate credit when copied or distributed. See the USNO privacy and distribution notice. Do not use this page for navigation, legal certification or safety-critical timing.
FAQ
When is the March equinox in 2031?
The March equinox is 20 March 2031 at 19:41 UT. The instant is listed in Universal Time.
When is the June solstice in 2031?
The June solstice is 21 June 2031 at 13:17 UT.
When is the September equinox in 2031?
The September equinox is 23 September 2031 at 05:15 UT.
When is the December solstice in 2031?
The December solstice is 22 December 2031 at 01:55 UT.