The autumnal equinox marks the moment when day and night are nearly equal in length, signaling the start of shorter daylight hours in the Northern Hemisphere. This celestial event also creates a unique alignment between Earth and the sun, offering skywatchers an opportunity to observe the changing seasons. Rooted in tradition, the equinox reflects ancient practices of tracking the sun’s shifting position in the sky. Whether for scientific curiosity or cultural significance, the phenomenon offers a reminder of Earth’s relationship with the cosmos.
The fall equinox, which arrives Tuesday in the U.S., brings shorter days, and chances to witness alignment between Earth and the sun. It's a modern version of ancient observances of a celestial shift.
