The spring equinox is the time of year when day and night are of equal duration. It marks the in-between point of the year's shortest and longest days.
Today, March 20, the Earth's axis will be perpendicular to the sun's rays, which only happens twice a year at each of the two equinoxes. After that, earth will continue moving, making for longer days in the northern hemisphere.
The equinox will happen at the same time as a solar eclipse in 2053 and 2072, though it doesn't always appear as close together as that.
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