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What Is the Spring Equinox? In the Northern Hemisphere, the spring equinox (also called the March equinox or vernal equinox across the globe) occurs when the Sun crossesthe celestial equator going south to north. It’s called the “celestial” equator because it’s an imaginary line in the sky above Earth’s equator. Imagine standing on the equator; the Sun would pass directly overhead on its way north.  On the March equinox, […]