Science ❯ Astronomy

Seasons

Equinox Winter Solstice Equinoxes Solstices Winter Spring Summer Solstice Seasonal Changes Autumn Summer Astronomical Seasons Solstice Meteorological Seasons Daylight Variation Autumnal Equinox Vernal Equinox Earth's Seasons Equinoxes and Solstices Solstices and Equinoxes Earth's Tilt Northern Hemisphere Spring and Autumn Daylight Hours Seasonal Events Spring Equinox

Earth Reaches Aphelion, Its Farthest Point From the Sun

Scientists say Earth’s 23.5° axial tilt and the uneven mix of land and ocean — not orbital distance — set seasons and shape global temperatures.

Blue Micromoon to Peak on May 31

Spring Starts Today as Vernal Equinox Arrives at 10:46 a.m. ET

Winter Solstice Arrives Sunday at 10:03 a.m. EST, Marking Year’s Shortest Day

Winter Solstice Arrives Sunday at 3:03 p.m. GMT, Marking Year’s Shortest Day

Autumn Begins as Sun Crosses the Equator at 2:19 p.m. ET

Equinox Boosts Northern Lights Chances as NOAA Flags Minor Geomagnetic Storms

Fall Begins Monday at 2:19 p.m. EDT With the 2025 Equinox