SUNDAY MARKS THE SPRING EQUINOX AND SIGNALS LONGER, WARMER DAYS AHEAD The equinox arrives at 11:33 a.m. Eastern time, but we'll actually have more than 12 hours of daylight. Here' why. By Justin Grieser Today at 7:00 a.m. EST
Equinoxes happen twice a year: once in March and once in September.
The reason we have equinoxes is because we do not orbit the sun completely upright. The earth is tilted on its axis by about 23.5 degrees, causing one hemisphere to receive more of the sun's light and energy at different times of the year.
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