9월 23일은 밤.낮의 길이가 똑 같은 추분(秋分: Autumn Equinox)On September 23, 2026, Earth will reach the September equinox, marking a key moment in Earth’s journey around the Sun. At the equinox, the Sun crosses the celestial equator, the imaginary line that projects Earth’s equator into the sky. In the Northern Hemisphere, it marks the beginning of astronomical autumn. In the Southern Hemisphere, it marks the b..