Friday, March 20 is the first day of spring 2015 for the northern hemisphere.
It arrives with the spring equinox, otherwise known as the “vernal equinox.”The spring equinox is one of the two annual equinoxes where the sun shines directly on the equator, making the length of day and night about the same. “Vernal” means “of relating to spring” and “equinox” means “equal night” in Latin.
The spring equinox happens every year on either March 20 or 21 and is one of the four seasonal astronomical events that gives planet earth its four distinct seasons. The other three events include the summer solstice, the autumnal equinox, and the winter solstice. “Solstice” means “sun standing” in Latin, because on these two dates the sun seems to stand still.
But despite March 20 being the official beginning of spring, its just when the equinox occurs, not necessarily when the weather changes—especially for more those living in the more northern latitude countries like the United States and Canada. Spring weather arrival varies with how far you are away from the equator. But eventually it will come!