Over the time span of a year, there are two equinoxes, one in September, and one in March. The March equinox is when the sun crosses north over an imaginary line in the sky above the equator called the celestial equator. The date and time given for the equinox is March 20th at 10:33 a.m. This marks the start of spring in the Northern Hemisphere and the start of Fall on the south side of the equator. During an equinox, all regions of Earth have the same amount of hours of sunlight because the Earth’s axis is perpendicular to the sun’s rays. Although, this does not mean that there are exactly 12 hours of daylight and 12 hours of darkness.