Today's the day where spring officially begins in the Northern Hemisphere. Today, the earth's axis is perpendicular to the sun. The sun shines directly on the Equator where your GPS shows 0°N. Day and night are almost exactly the same length, and the sun rises exactly in the east and sets directly in the west on this day.
Read more about it at http://www.timeanddate.com/calendar/march-equinox.html
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