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The beginnings of spring and fall/autumn (depending on where you are on the globe) are determined astronomically, and they occur at an exact moment, the same moment for everyone on Earth. The Vernal Equinox is the moment when spring begins in the northern hemisphere-- fall/autumn begins at this time in the southern hemisphere, and it is the moment that the center of the sun passes over the equator as it travels north along the ecliptic (the ecliptic is the imaginary path that describes the apparent motion of the sun during the course of the year)This happens in late March.

The Autumnal equinox is when the center of the sun passes over the equator as it travels south along the ecliptic, in late September. This is the beginning of autumn for us in the north, and the beginning of spring for the Southern Hemisphere.

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