The Vernal Equinox
Before the invention of calendars and other modern methods of tracking years and seasons, people relied on the position of the sun in the sky and obvious signs in nature to indicate the passing of time.
When the equator and the hemispheres of the Earth became common knowledge, it was understood that the slightly tilted rotation of the earth causes different hemispheres to experience different seasons. The vernal equinox is the event that occurs in late March, which brings spring to the parts of the earth in the Northern Hemispheres.
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