In theory, this is the day that the time from sunrise to sunset around the world is at 12 hours. The actual time is a little over 12 hours for two reasons...1) the atmosphere bends the sun's rays a bit when it is at the horizon.
2) the main reason though is the way sunrise and sunset are measured. When the tip of the sun appears, that is the time of sunrise. At sunset, it is when the last tip of the sun disappears. Since it is not measured at the midpoint of the sun crossing the horizon, this will add several minutes to the time between sunrise and sunset.
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