You don’t have to look far to see signs of spring. From the budding of the trees and the warming of the temperatures to the animals coming out of their winter hideouts, there seems to be a promise of new birth and color in the springtime air.
The first day of spring in the U.S. is considered to be around March 20 or 21, depending on what day the vernal equinox occurs. This is when the sun sits directly above the equator on its apparent trip northward. Of course this sun isn’t moving; Earth is. As Earth revolves around the sun, the top half, called the Northern Hemisphere, becomes tilted more toward the sun as winter turns to spring. Meanwhile the bottom half, the Southern Hemisphere, becomes tilted more away from the sun. So it is autumn for people in Australia and the southern parts of Africa and South America.