An equinox is a twice-yearly event in March and September when the Sun is directly above the equator, causing nearly equal ...

For the second time in 2025, an incredible astronomical event is about to change the seasons on Earth. The September equinox is almost upon us, with autumn about to begin in the Northern Hemisphere, ...

The first day of meteorological spring is March 1, while the astronomical first day of spring varies based on the vernal equinox. Astronomical seasons depend on the Earth's position relative to ...