Spring is here with the arrival of the vernal equinox, spring equinox, or March equinox lasting till about June 22. The first day of spring varies slightly yearly, depending on the tilt of the earth in relation to the Sun, an uneven number of days, and seasons among other factors. In the Northern Hemisphere, we mark the beginning of spring when the Sun crosses the equator line as it tilts towards the Sun bringing an increase in daylight hours and warmer temperatures recording about equal length in day and night (12 hours).
During winter, the earth shifts away from the sun.
Fun fact: Chinese tradition includes the belief that an egg can be made to stand on end at the exact moment when winter ends and spring starts. So try it at 11:06pm tonight.