Happy Equinox! Today is the Vernal (Spring) Equinox in the Southern Hemisphere and Autumnal Equinox in the Northern Hemisphere. This is when the Sun's appears to be directly above the equator, giving equal light in both hemispheres. Around now, the lighting in the Northern Hemisphere and Southern Hemisphere is equal. That means around now, every location in the world has about 12 hours of daylight and 12 hours of night time. This cool timelapse from a NASA satellite shows how the seasons change