At last! It's the first day of spring! 🌸🌼🌺 The vernal (aka spring) equinox – which marks the beginning of astronomical spring in the Northern Hemisphere – occurs on Sunday at 11:33 a.m. EDT. The equinox marks the precise moment the sun's rays shine directly on the Earth's equator. (For folks outside the eastern time zone, it will be at 10:33 a.m. CDT, 9:33 a.m. MDT and 8:33 a.m. PDT.) 📸 Patrick T. Fallon, AFP via Getty Images