Daily Archives: March 27, 2013

By two measures, spring has arrived. Astronomically, spring, or the vernal equinox, occurs around March 20 each year. It is defined as when the tilt of Earth’s axis is inclined neither toward nor away from the Sun. The moment that marks the beginning of spring is when the sun is directly overhead at the equator. This year that occurred on March 20, when the maximum temperature in Madison was only 21 degrees. Continue reading →