We recognize today as the first official day of Spring 2011 in the United States of America. At Spring Equinox (the start of spring), daylight and night are approximately 12 hours long at the equatorial plane. When transitioning from the winter season to the spring season, the sun is moving North as soon as the sun crosses the equator. The sun rises to the midpoint of the sky and our North Pole tilts towards the sun.
Depending on when the sun crosses the equator, the first day of spring in the Southern Hemisphere will be around September 20th or 21st. In other areas around the world such as New Zealand and Australia, they will recognize September 1st as the first official day of spring. March winds bring April showers. April showers bring May flowers! Happy Spring everyone!