The autumnal equinox is a significant astronomical event that marks the official start of fall in the Northern Hemisphere. It occurs when the sun crosses the celestial equator, an imaginary line ...

the spring equinox for 2025 is at 5:01 a.m. While we observe the equinox as the first day of spring or fall, it’s just an instant. No, there’s not exactly 12 hours of daylight and 12 hours of ...