The spring equinox, or vernal equinox, occurred at 1:48 EDT this morning. That's when the sun, on its annual springtime journey from south to north, appears to cross the celestial equator into the northern half of the sky. Egypt's Great Sphinx faces due east, where the sun rises today. It is the official start of spring in the Northern Hemisphere, and fall in the Southern. The sun's apparent seasonal migration occurs because of our planet's 23.4-degree tilt with respect to the sun.
FRANK ROYLANCEThe Baltimore Sun