The Summer equinox will be June 20, 2025. The meteorological start of winter began on Dec. 1 and will run through Feb. 28. The solar winter runs from November through January.

The fall equinox, also known as the autumnal equinox, is when astronomical fall arrives. This year, it will occur at 8:44 a.m. EDT on Sept. 22, according to the Naval Observatory.

The spring equinox, marking the first day of spring in the northern hemisphere, occurs at 5:01 a.m. March 20. The spring equinox signifies the halfway point between the summer and winter solstices.

The autumnal equinox occurs when the sun "crosses the equator going from north to south," the almanac says, causing the sun ...

When Is The Winter Solstice? If you like to be exact about these things, this year’s winter solstice will occur this Saturday, December 21, at 4:21 a.m. EST. What Is The Winter Solstice?