| Event | Instant |
|---|---|
| March equinox | 20 March 2025 09:01 UTC |
| June solstice | 21 June 2025 02:42 UTC |
| September equinox | 22 September 2025 18:19 UTC |
| December solstice | 21 December 2025 15:03 UTC |
These instants are when the Sun's apparent ecliptic longitude hits 0, 90, 180, or 270 degrees. Meteorological seasons, which start on the first of March, June, September, and December, are a different calendar.